How to get separate totals on an SSRS report based on values in rows?

I have a SQL 2017 SSRS report that is grouped by state by month. There are two lines per state with the 12 months spread across each line. The first line is total invoice amount and the second line is total sales tax amount. I am now trying to configure the footer to show the total for all states with one being the total for the sales amount and the other being the total for the sales tax amounts. I do have a column called Type where Sales = sales amount and Tax = sales tax amount. I tried creating two groups at the bottom based on Type with filters but both lines keep giving me to total of both. Underneath this report is a SQL query with a union between the sales amounts and the sales tax amounts. How should I structure the totals to present the two separate totals?