Two schedules, one building

When I LOCK to certain buildings on the Therapist tab, It would be excellent to select two buildings for the same time span. I'm in a situation where I see students at a Jr/Sr High School that is physically the same building but the students run on two very different schedules for Junior and Senior High. I've marked them as two separate buildings to put their unique bell schedules in, however, I can only LOCK in to Jr .or Sr. High for a certain day, but would like to choose both since they are technically in the same building.