I'd like to propose a new door type - overhead lift or rolling garage door. I tried to fudge it as a 16' wide window, but the software inserted 'framing' in the middle of the 'window'.
Final workaround: I exploded the window (so I could edit out the support framing) made the wall reappear, so I had to delete the continuous wall & redraw it as two seperate entities. Then noodle the 'window' into the garage door I wanted.
I'm not sure I totally understand, but one thing I can tell you is there was no need to delete the wall to make 2 short ones. Just insert a generic opening the size you need.
Then you can draw whatever you want in that space. This is what I do for garage doors and it works well.