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Sub Process 
This wizard consists of task completion steps and approval steps. If the last step of the wizard is an approval step and the wizard has been launched for an approval work item from Business Workflow the following functionality is provided. The creator of the wizard can configure that the approval from the last step is automatically executed as an approval of the Business workflow work item. The UWL work item can be a Business Workflow work item or a Collaboration Task work item.
It is possible to create a process which refers to any UWL work item. This process can be conceived as a sub process of the workflow to which the UWL work item belongs.
You can access the sub process creation steps from the Universal Worklist, or from the Collaboration launch pad. Following are the steps:
Accessing from UWL:
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1. From the portal screen choose Home ® Work.
2. Choose New Task to start the workflow creation process.
3. Choose Create Ad-Hoc Request to…
Accessing from the Collaboration launch pad:
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1. From the portal screen click Collaboration. Choose Create Tasks. choose the task directly from the available options.
2. Choose Create Task to start the workflow creation process.

Note that there are no mechanisms in place which lock the original work item until the spontaneously created sub process completes.
You can create a sub process consisting of multiple steps assigned to a user or to a different set of process participants in the process flow.
A user can start a sub process from the UWL. The link New Ad Hoc Request on the preview screen or the detail screen of the selected UWL work item launches the Workflow wizard.
In the wizard the user can define whether the final action of the UWL sub process is mapped back to its belonging UWL work item. For defining this there is a checkbox Map decision to parent task. This mapping is valid if the last step is an approval step.
Once a UWL sub process has been created two restrictions are imposed on the related UWL work item:
· A user cannot complete the UWL work item before the completion of its UWL sub process.
· A user cannot start a second UWL sub processes from the same UWL work item until the active UWL sub process is completed.
