Mirroring sheetmetal parts

I'm mirroring a lh assy. I need to be able to add holes to a lh
sheetmetal part in that assy at the part level without having them show
up in the rh sheetmetal part. If I had made the rh assy and mirrored
that to get the lh assy I wouldn't have this problem.

I wouldn't be adverse to filling the holes in the rh sheetmetal part
but, in sheetmetal, I can't find a way to do that. (extrude, etc only
allows cuts in sheetmetal.

Thanks

 

I am not a a sheet metal expert, but here's how I do it for mirrored
injection molded parts.

1. Make a common part.
2. Create a left hand part and a right hand part.
3. Merge the common part into the left hand part.
4. Merge the common part into the right hand part.
5. You can now add features to the left hand part that won't show up
in the right hand part.
6. You can now add features to the common part that will show up in
both left and right hand parts.
7. In WF2 to merge model: insert/shared data/merge from other model

Bill