ToltWA

I got the job done by copying and pasting one floor at a time with Edit Area, after creating reference lines on each floor for alignment.  I cleaned it up using the Align with Wall Below tool,

Thank you, Solver

"Edit Area" only allows me to copy and paste one floor at a time.  It might just be a built-in limitation of my consumer-level software.  There is no sub-menu after selecting Edit Area.  No option to select all floors.

I've spent the last few hours copying and pasting one floor at a time.  Maddening trying to align each floor.  I would love it if I could create a couple of reference lines and duplicate their exact position on each floor.  Then, I suspect my solution is mastering the snap settings.

Home Designer Suite 2020 21.3.1.1

Can I copy an entire building and paste it on to another plan (different file)?

On a plan with two buildings, can I move an entire building relative to the other?