To start the Merge Manager, click the ClearCase Merge
Search icon on the ClearCase advanced toolbar.
The Merge Manager helps you to select a ClearCase view where
the merges will take place, select folders or files to consider for merging,
and optionally override default selection criteria for the versions to merge
from (the from-version) and specify other merge options.
If you are using UCM, you do not have to use the Merge Manager for routine rebase and deliver operations, which detect required merges and handle them as needed.