Creating a Reference in the Properties View

To create a reference to another task on the General tab of the Properties view for the task, complete the Referenced Task field by clicking the picker and selecting a task from the list:

After you have a created a task reference, clicking Go To selects the target of the reference task and brings it into the visible part of the Process Editor (it also displays the Properties view for the task). To return to the previously-selected task, click on the toolbar.