Clearcase VOB merge

Question

How to merge the files bettween two different VOBS with different branches

Answer 1

You can't through a regular ClearCase merge.

Merges are based on a 3-way merge between a common ancestor, a source and a destination version of the same file

And by definition, files from different Vobs won't share a common history.

So the only way is a manual merge through a third-party external diff tool (like kdiff3 for instance), in order to compare/merge two different trees of files.
The fact that those trees are managed by ClearCase Vobs won't be relevant for that tool.