We are in the process of upgrading 11i to r12.1 . Am in the process of merging all pre install patches as per the ML note (video) Oracle E-Business Suite Pre-install Patches Report [Video] [ID 1448102.1] .
The above note has pre install patches for many modules. can I merge all this patches with a unified driver. But these patches belong to many modules.
Can I still merge it
yes you can use it even if they belongs to different products.
be sure to check all readme's before merging for specific steps. If merging is not allowed the Team should mention it in the readme.
Also be sure you Apply all post steps from the patch after Applying the merged driver.
Be sure to test first and have a valid backup.