There is the combined "Business Tax Return" that is due April 15th of each year. This combined return is for the city and county both... and is based on Gross Sales... with some exclusions to get to a taxable amount.  You file and pay these on the TNTAP website,....not  a proseries application.  The tax rates differ for retail and wholesale, and for what type of 'gross sales' you actually have. You register for these on the tenn dept of rev website, just like the F&E return.

Hope this helps.  btw, I ignored any discussion regarding sales tax because I assumed that was already ironed out, if applicable.