how to backup and remove an clearcase activity

Question

I need to remove the code changes of an activity from the child stream, which is shared among two projects. Wanted to remove code changes from Project A but I need to secure not to lose the changes in Project B

Can someone suggest me the possible solution and the next steps to be taken care to get rid of this issue.

Answer 1

See "Reverse Change set of an activity in Clearcase": you can use ccperl cset.pl -undo, or do for each file in an activity a negative or subtractive merge.

In both case, the goal is to create a new activity whose change set will represent the negative image of the existing activity.
You can then do what you want/need with it, like deliver it to another stream where the first activity was already delivered.