cleartool find is a good start.
You can execute them anywhere in your (instant or dynamic) view
To generate a list of those items that contain the tagged version (REL1), use the following syntax for find cleartool:
UNIX and Linux:
% cleartool find -all -element '{lbtype_sub(REL1)}' -print
Windows:
cleartool find -all -element "{lbtype_sub(REL1)}" -print
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