Created a group (apartments) & then copied them as needed on level 1. Then I select all the group instance on current level with corridor walls.
Then used copy, changed view to level 2, paste (aligned to selected level). Now that worked, but the walls are showing as a "generic" wall, not a wall with layers of gwb & channels, as they do on level 1. The visual style is set to wireframe. I'm not sure what I missed or did or to check....
