You can quickly list all files from a particular branch:
cleartool find . -type f -branch "brtype(abranch)" -print
I would recommend combining that with:
-user
to limit to a particular user, in case several users use the same branch.
cleartool find . -type f -branch "brtype(abranch)" -user aloginname -print
-created_since
filter, to find all elements created since a certain date, in case their is incremental review for a work done on the same branch.
cleartool find . -type f -branch "brtype(abranch)" -element "{created_since(10-Jan)}" -user aloginname -print