How many seats are available in this MoS, for this day?

We are doing a promotion for which we use certain Mode of Sale, and an allocation that is set only to that Mode of Sale. We often sell out days in advance. I'm looking for a way to say "For this performance(s), how many seats are reserved, and how many seats are remaining, in this mode of sale/allocation?"

Is that doable? Besides using TNEW, logging in and switching the MoS, or going through each day's seat map and manually counting, I can't find a way to have this question answered. Is there a report that would answer this question? I've combed through the Ticketing Box Office section of reports, and also through Analytics.