The way i would handle this would be to setup an "assembly" type workflow.

So MoI allows you to launch multiple, concurrent sessions. I would have one file with my overall scale. Then others can be created for whatever the current need is.

Copy and paste between the 2 works like a charm.

So with this, i can have a 64 story building, and model a tennis shoes shoelace eyelet, on the 34th floor, next to the cup on the window sill......