Expected output is that if the user makes a selection of Fiscal_Year = 2020-2021, the output is the sum of sales for Fiscal_Year 2019-2020 WHERE Fiscal_Month sales of 2020-2021 > 0. In this case it would be $7 because;
User's selection = 2020-2021
Fiscal_Month where Sales>0; Dec ($5) and Jan ($7)
So; Sum Dec2019-2020 ($4) and Jan2019-2020 ($3)
Sorry if I'm not explaining clearly. Thank you for your patience!