Clearcase substractive merge

How to do a subtractive merge in clearcase to remove changes you made in a version

1) First list the version tree.

bash # /vobs/ims_scm/test> ct lsvtree -s -all .

.@@/main

.@@/main/0

.@@/main/1

.@@/main/2

.@@/main/3

.@@/main/4

.@@/main/5

.@@/main/6

.@@/main/7

.@@/main/8

.@@/main/9

.@@/main/10

2) Remove the changes made in version 9

bash # /vobs/ims_scm/test> ct ls -d

.@@/main/10 Rule: /main/LATEST

bash # ct co -nc .

bash # /vobs/ims_scm/test> ct ls -d

.@@/main/10 Rule: /main/CHECKEDOUT

ct merge -to . -delete -version /main/9

Now version 11 of the directory will have the changes made in version 8