A user with task edit rights (Admin, Project Manager and members with task edit rights) can request a relaunch in the contextual menu of any output pin with a number.
This will re-create a new workflow task which is similar to the task that gets relaunched.
The workflow needs to be stopped first.
This only works for first-level workflows, not for workflows which are already started from another workflow.
When a workflow is re-launched, WebCenter automatically makes sure that any dependent tasks will depend on the new workflow task, rather than on the canceled one.
Procedure
Follow these steps to relaunch a workflow task:
Hover over the node in the workflow. This will bring up an information bubble about that node.
Click Relaunch in the contextual menu of the info bubble.