diff --git a/src/ConductorSharp.Engine/Builders/DecisionTaskBuilder.cs b/src/ConductorSharp.Engine/Builders/DecisionTaskBuilder.cs
index e316cd18..55284d46 100644
--- a/src/ConductorSharp.Engine/Builders/DecisionTaskBuilder.cs
+++ b/src/ConductorSharp.Engine/Builders/DecisionTaskBuilder.cs
@@ -28,6 +28,17 @@ public DecisionTaskBuilder<TWorkflow> AddCase(string caseName)
             return this;
         }
 
+        public DecisionTaskBuilder<TWorkflow> WithTask<F, G>(
+            Expression<Func<TWorkflow, SubWorkflowTaskModel<F, G>>> referrence,
+            Expression<Func<TWorkflow, F>> input
+        ) where F : IRequest<G>
+        {
+            var builder = new SubWorkflowTaskBuilder<F, G>(referrence.Body, input.Body);
+            _caseDictionary[_currentCaseName].Add(builder);
+
+            return this;
+        }
+
         public DecisionTaskBuilder<TWorkflow> WithTask<F, G>(
             Expression<Func<TWorkflow, LambdaTaskModel<F, G>>> taskSelector,
             Expression<Func<TWorkflow, F>> expression,
diff --git a/test/ConductorSharp.Engine.Tests/ConductorSharp.Engine.Tests.csproj b/test/ConductorSharp.Engine.Tests/ConductorSharp.Engine.Tests.csproj
index d5811d3b..ac1f85eb 100644
--- a/test/ConductorSharp.Engine.Tests/ConductorSharp.Engine.Tests.csproj
+++ b/test/ConductorSharp.Engine.Tests/ConductorSharp.Engine.Tests.csproj
@@ -10,6 +10,7 @@
     <None Remove="Samples\Tasks\CustomerGet.json" />
     <None Remove="Samples\Tasks\EmailPrepare.json" />
     <None Remove="Samples\Workflows\Arrays.json" />
+    <None Remove="Samples\Workflows\ConditionallySendCustomerNotificationOutput.json" />
     <None Remove="Samples\Workflows\NestedObjects.json" />
     <None Remove="Samples\Workflows\SendCustomerNotification.json" />
     <None Remove="Samples\Workflows\StringInterpolation.json" />
@@ -41,4 +42,8 @@
     <ProjectReference Include="..\..\src\ConductorSharp.Engine\ConductorSharp.Engine.csproj" />
   </ItemGroup>
 
+  <ItemGroup>
+    <EmbeddedResource Include="Samples\Workflows\ConditionallySendCustomerNotificationOutput.json" />
+  </ItemGroup>
+
 </Project>
diff --git a/test/ConductorSharp.Engine.Tests/Integration/WorkflowBuilderTests.cs b/test/ConductorSharp.Engine.Tests/Integration/WorkflowBuilderTests.cs
index 0b704f4c..4b7386a9 100644
--- a/test/ConductorSharp.Engine.Tests/Integration/WorkflowBuilderTests.cs
+++ b/test/ConductorSharp.Engine.Tests/Integration/WorkflowBuilderTests.cs
@@ -49,5 +49,16 @@ public void BuilderReturnsCorrectDefinitionArrayTask()
 
             Assert.Equal(expectedDefinition, definition);
         }
+
+        [Fact]
+        public void BuilderReturnsCorrectDefinitionSubworkflowInDecision()
+        {
+            var definition = SerializationUtil.SerializeObject(new ConditionallySendCustomerNotification().GetDefinition());
+            var expectedDefinition = EmbeddedFileHelper.GetLinesFromEmbeddedFile(
+                "~/Samples/Workflows/ConditionallySendCustomerNotificationOutput.json"
+            );
+
+            Assert.Equal(expectedDefinition, definition);
+        }
     }
 }
diff --git a/test/ConductorSharp.Engine.Tests/Samples/Workflows/ConditionallySendCustomerNotificationOutput.cs b/test/ConductorSharp.Engine.Tests/Samples/Workflows/ConditionallySendCustomerNotificationOutput.cs
new file mode 100644
index 00000000..b798be44
--- /dev/null
+++ b/test/ConductorSharp.Engine.Tests/Samples/Workflows/ConditionallySendCustomerNotificationOutput.cs
@@ -0,0 +1,30 @@
+namespace ConductorSharp.Engine.Tests.Samples.Workflows;
+
+#region models
+public class ConditionallySendCustomerNotificationInput : WorkflowInput<ConditionallySendCustomerNotificationOutput>
+{
+    public dynamic ShouldSendNotification { get; set; }
+    public dynamic CustomerId { get; set; }
+}
+
+public class ConditionallySendCustomerNotificationOutput : WorkflowOutput { }
+#endregion
+[OriginalName("NOTIFICATION_conditionally_send_to_customer")]
+public class ConditionallySendCustomerNotification : Workflow<ConditionallySendCustomerNotificationInput, ConditionallySendCustomerNotificationOutput>
+{
+    public DecisionTaskModel SendNotificationDecision { get; set; }
+    public SendCustomerNotificationV1 SendNotificationSubworkflow { get; set; }
+
+    public override WorkflowDefinition GetDefinition()
+    {
+        var builder = new WorkflowDefinitionBuilder<ConditionallySendCustomerNotification>();
+
+        builder.AddTask(
+            wf => wf.SendNotificationDecision,
+            wf => new() { CaseValueParam = wf.WorkflowInput.ShouldSendNotification },
+            ("YES", builder => builder.WithTask(c => c.SendNotificationSubworkflow, wf => new() { CustomerId = wf.WorkflowInput.CustomerId }))
+        );
+
+        return builder.Build(opts => opts.Version = 1);
+    }
+}
diff --git a/test/ConductorSharp.Engine.Tests/Samples/Workflows/ConditionallySendCustomerNotificationOutput.json b/test/ConductorSharp.Engine.Tests/Samples/Workflows/ConditionallySendCustomerNotificationOutput.json
new file mode 100644
index 00000000..0724c90b
--- /dev/null
+++ b/test/ConductorSharp.Engine.Tests/Samples/Workflows/ConditionallySendCustomerNotificationOutput.json
@@ -0,0 +1,98 @@
+{
+  "ownerApp": null,
+  "createTime": 0,
+  "updateTime": 0,
+  "createdBy": null,
+  "updatedBy": null,
+  "name": "NOTIFICATION_conditionally_send_to_customer",
+  "description": "{\"description\":null,\"labels\":null}",
+  "version": 1,
+  "tasks": [
+    {
+      "queryExpression": null,
+      "name": "DECISION_send_notification_decision",
+      "taskReferenceName": "send_notification_decision",
+      "description": null,
+      "inputParameters": {
+        "case_value_param": "${workflow.input.should_send_notification}"
+      },
+      "type": "DECISION",
+      "dynamicTaskNameParam": null,
+      "caseValueParam": "case_value_param",
+      "caseExpression": null,
+      "expression": null,
+      "evaluatorType": null,
+      "scriptExpression": null,
+      "decisionCases": {
+        "YES": [
+          {
+            "queryExpression": null,
+            "name": "NOTIFICATION_send_to_customer",
+            "taskReferenceName": "send_notification_subworkflow",
+            "description": "{\"description\":null}",
+            "inputParameters": {
+              "customer_id": "${workflow.input.customer_id}"
+            },
+            "type": "SUB_WORKFLOW",
+            "dynamicTaskNameParam": null,
+            "caseValueParam": null,
+            "caseExpression": null,
+            "expression": null,
+            "evaluatorType": null,
+            "scriptExpression": null,
+            "decisionCases": null,
+            "dynamicForkJoinTasksParam": null,
+            "dynamicForkTasksParam": null,
+            "dynamicForkTasksInputParamName": null,
+            "defaultCase": null,
+            "forkTasks": null,
+            "startDelay": 0,
+            "subWorkflowParam": {
+              "name": "NOTIFICATION_send_to_customer",
+              "version": 1,
+              "taskToDomain": null,
+              "workflowDefinition": null
+            },
+            "joinOn": null,
+            "sink": null,
+            "optional": false,
+            "taskDefinition": null,
+            "rateLimited": false,
+            "defaultExclusiveJoinTask": null,
+            "asyncComplete": false,
+            "loopCondition": null,
+            "loopOver": null
+          }
+        ]
+      },
+      "dynamicForkJoinTasksParam": null,
+      "dynamicForkTasksParam": null,
+      "dynamicForkTasksInputParamName": null,
+      "defaultCase": null,
+      "forkTasks": null,
+      "startDelay": 0,
+      "subWorkflowParam": null,
+      "joinOn": null,
+      "sink": null,
+      "optional": false,
+      "taskDefinition": null,
+      "rateLimited": false,
+      "defaultExclusiveJoinTask": null,
+      "asyncComplete": false,
+      "loopCondition": null,
+      "loopOver": null
+    }
+  ],
+  "inputParameters": [
+    "{\"should_send_notification\":{\"value\":\"\",\"description\":\" (optional)\"},\"customer_id\":{\"value\":\"\",\"description\":\" (optional)\"}}"
+  ],
+  "outputParameters": null,
+  "failureWorkflow": null,
+  "schemaVersion": 2,
+  "restartable": true,
+  "workflowStatusListenerEnabled": true,
+  "ownerEmail": null,
+  "timeoutPolicy": null,
+  "timeoutSeconds": 0,
+  "variables": null
+}
\ No newline at end of file
diff --git a/test/ConductorSharp.Engine.Tests/Samples/Workflows/SendCustomerNotification.cs b/test/ConductorSharp.Engine.Tests/Samples/Workflows/SendCustomerNotification.cs
index 21895d79..90e16f9a 100644
--- a/test/ConductorSharp.Engine.Tests/Samples/Workflows/SendCustomerNotification.cs
+++ b/test/ConductorSharp.Engine.Tests/Samples/Workflows/SendCustomerNotification.cs
@@ -1,5 +1,16 @@
 namespace ConductorSharp.Engine.Tests.Samples.Workflows;
 
+#region models
+public class SendNotificationInput : IRequest<SendNotificationOutput>
+{
+    public dynamic CustomerId { get; set; }
+}
+
+public class SendNotificationOutput { }
+
+[OriginalName("NOTIFICATION_send_to_customer")]
+public class SendCustomerNotificationV1 : SubWorkflowTaskModel<SendNotificationInput, SendNotificationOutput> { }
+
 public class SendCustomerNotificationInput : WorkflowInput<SendCustomerNotificationOutput>
 {
     public dynamic CustomerId { get; set; }
@@ -9,7 +20,7 @@ public class SendCustomerNotificationOutput : WorkflowOutput
 {
     public dynamic EmailBody { get; set; }
 }
-
+#endregion
 [OriginalName("NOTIFICATION_send_to_customer")]
 public class SendCustomerNotification : Workflow<SendCustomerNotificationInput, SendCustomerNotificationOutput>
 {