How to backout a P4 changelist

If a check-in of changelist , had edited a.c, b.h,

1. p4 sync @
2. p4 edit //depot/a.c //depot/b.h
3. p4 sync
4. p4 resolve -ay
5. p4 submit

Of course, there can be mix and match. I CL# contained a.c, b.h, c.txt, d.macro,
the above set of operations will maintain the changes for c.txt and d.macro, which may be intended.

For more on the same topic refer to
http://kb.perforce.com/?article=014