How to mark a succession plan as completed

Summary:

Hi,

When we create a succession plan, we add candidates/potential successors in that plan and give them ranking. But after some time, when that specific position is vacant or the incumbent has resigned and one of the potential successor has filled the position or replaced that incumbent, how can we update this information in the succession plan and mark the plan as completed.
Currently I'm unable to find this information while editing the succession plan. We are on 24D and we have enabled redwood.
I'm only able mark the plan as active or inactive.

To summarize the question, We need to update below information in the succession plan,