Does anyone have any experience with concurrent reservations in different cities? I have a long-term stay coming up for work, but might plan a personal "trip-within-a-trip" for one night during that trip.

Rather than break up my long-term reservation (and risk losing the negotiated long-term rate), pack up my things, check-out/check-in, I was wondering if I could book and complete an award stay in one city while still checked into a Marriott property in another.