How to create a formula to substract the total of a category

[OCBB_SFAFPandA]

Hello,

I have a Sales column, and need to substract out a specific number. The other number is in a category from another sales table. How would I be able to do this?

I have this measure

TY Sales = (SUM(FACTS_Sales[Sales]))

I am trying to get another # something like

Sum(Facts_Category[category]="tax" 

Then create another sales total - sales without tax = TY sales - tax

[OCBB_SFAFPandA · Accepted solution]

figured it out, just needed an equal sign. For anyone looking

Create a measure

CALCULATE( SUM(Sales[Sales]),Category[Category]="TAX")

 then create another measure to minus the sales with this new measure.