Tasks that have already been executed can be restarted and you can define the required Execution Options.
This function allows you to execute the task again using different parameters to the original ones; this is useful particularly in case of tasks included in a Workflow because it allows you to restart the task and modify its settings without having to execute the entire Workflow again.
https://docs.automic.com/documentation/webhelp/english/AA/12.3/DOCU/12.3/Automic%20Automation%20Guides/help.htm#AWA/Executions/obj_ExecutingRestart.htm?