There are several ways, many of which have already been mentioned directly or alluded to.  One that hasn't been mentioned though is to simply use a Custom Schedule.  Just make sure all rooms in any given unit are set to report to a Schedule using a Custom Schedule Category and then set your schedule to report only that one Category.  Make sure your schedules for each unit are set to report a Totals Row and there you have it.  In fact, if you set your Schedule to Swap Rows/Columns and then Right
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