How to dual enroll a scout in two troops.
First, you need to fill out another youth application for the 2nd troop. Make sure you check the multiple registration bubble and fill in the Scout’s BSA#.
You can either wait for the Scout to appear on the 2nd roster (one day after appearing on the roster in Member Manager in my.scouting.org) or go to the Scout’s membership page, click +Add and add the 2nd unit. An admin from that unit will need to approve the membership.