Create a branch of production release: cvs rtag -b -r Vacuum-R4-1-0 Vacuum-R4-1-0-BRANCH Vacuum
Update or checkout branch into the directory devl: cvs co -r Vacuum-R4-1-0-BRANCH -d devl Vacuum
Apply the patch from step 1, resolve any failures or conflicts.
Compile and tag
Commit: cvs commit
Tag appending "Pn" to the tag from which you branched, where N is the patch number starting at 0: cvs tag Vacuum-R4-1-0-P0
Update or checkout new patch level release
Compile and install
Repeat above steps for all releases/patches that are in production. Please note that for multiple patches of the same branch, you will need to check out the branch, which will not have sticky tags. The branch will have all patch changes.