While your question has been answered, I thought I'd chime in for anyone else coming into this conversation to *strongly* advise against adding them to your room reservation when they already have a second one.
Two simultaneous room reservations for one person is just asking for problems with MagicBands, room access, charging accounts, duplicate profiles, etc. (I was advised against it by the Help Desk when I called to ask how to handle a friend who had a reservation of his own at one of the All-Stars that overlapped the first couple days with our two-bedroom reservation at Saratoga. He was going to move into the second bedroom partway through our reservation when the friends who were in that bedroom the first few nights left. He ended up creating a dummy second account with his work email just for that All-Star reservation, knowing that the Band on that account would be useless after that stay)
While there may be no problems at all, with all the quirks of the MDE system you're just as likely to end up at Guest Services for an hour straightening things out.
-Rob