THERE IS A WAY TO MIRROR A MULTI SECTION SOLID IN CATIA
I DRAWN A OBJECT USING THE MULTI SECTION SOLID I WANT TO MIRROR IT
Accepted answer
Mirror current solid instead of the multisection solid command.
If the part already has solids that should not be mirrored, then make the multisection solid inside a new body. (insert body) and mirror in part design the whole current solid.
Use boolean operations to add this separate body to your partbody.
