How to subtract 2 columns in different tables based on a name and date?

[Anonymous]

I have 2 tables with a 1:many relationship.  I have 1 table that has account name, units sold, and the year and month.  I have another table with multiple months that has the budget data and I want to subtract them based on year and month and the account name. I want the formula to work form the duplicate accounts so I can see accounts that have been budgeted for but have no sales.  Any help with this?  Thanks!

Account Name	Year	Month	Budget	Sales	Difference between Budget & Sales

t work right.  Ideally I want 

[lbendlin]

Please provide sample data that covers your issue or question completely.
https://community.powerbi.com/t5/Community-Blog/How-to-provide-sample-data-in-the-Power-BI-Forum/ba-...
Please show the expected outcome based on the sample data you provided.

https://community.powerbi.com/t5/Desktop/How-to-Get-Your-Question-Answered-Quickly/m-p/1447523