Reusable Sub-Processes
To demonstrate how to transform a Task into a Reusable Sub-Process, we will use the following diagram:

The diagram refers to a Purchase Request Process. We are going to transform the Purchase Order task into a Reusable Sub-Process.
Steps to Configure a Reusable Sub-Process
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In the First step of the wizard, click Edit Process.  
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Right-click the Task you wish to convert to a Reusable Sub-Process, - In this case, the Purchase Order task.
- Select Transform to Sub-Process.
  
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The Sub-Process Wizard will launch, showing the Sub-Process types. - Select the Reusable option.
  
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A Properties window will display the following:  Controls Description Multiple Check-box Sets the Sub-Process as Multiple. Processes drop-down list Displays the existing processes list and sets the selected one as the Sub-Process. Add button Lets the user create a new process. Process version drop-down list Displays the process versions list and sets the selected one as the Sub-Process version. Diagram Displays a preview snapshot of the process model selected. If a new process is selected, the Diagram control will remain empty. Status Bar Presents the Sub-Process status configuration horizontally. 
Defining the Reusable Sub-Process
You can either select an existing Process or create a new one:
To Set an Existing Process
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Click the drop-down list to select the desired process. 
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Click the Process version drop-down list and select the desired version. 
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Click the Finalize button.  
To Create a New Process
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Click the Add button in the properties window.  
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Type the name of the new Process and click Create.  
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Select the Process from the drop-down list and click Finalize.  
Setting the Exit Mode
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Select the Advanced tab to set the Exit mode within the following options: - 
Stand Alone: 
 The parent Process continues with the next step in its Process flow as soon as the Sub-Process is created, without waiting for it to be completed.
 If the parent Process ends, the Sub-Process remains in effect (opened).
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Integrated: 
 The Sub-Process must be fully completed before the parent Process continues with the next Activity in its flow.
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In this case, the Purchase Order Sub-Process must be completed before the Purchase Request Process finishes. 
 Select Integrated mode.
  
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Select the Exit mode from the two options: - 
Stand Alone: The parent Process continues with the next step without waiting for the Sub-Process to complete. 
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Integrated: The parent Process waits for the Sub-Process to fully execute before continuing. 
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Since the Purchase Order Sub-Process must be completed before the Purchase Request Process finishes, select Integrated mode. 
 
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Finally, click Finish. Your Purchase Order Reusable Sub-Process has been successfully configured. 
Important Note
The Reusable Sub-Process must have an Access Type defined as Process or Only Sub-Process in the Process properties.
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If not, it will not appear in the wizard's selection list, even if it has been created. 
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In the Expert View, right-click the Sub-Process' version and select Properties. 
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Ensure that either Process or Only Sub-Process is selected. 