dynamic subtraction

[Tiz74]

Hi,
I have two tables, Sheet 1 and Demand. The two tables are joined. The Demand table contains two distinct economic values. the link between the two tables is given by Demand PPM and Sheet 1 DemandPPM.
according to the filters I would like to be able not only to add the values dynamically as present in the measure TotEffort = SUM( Sheet1[Effort] ), but I would like to be able to subtract dynamically by selecting one of the two values in the table Sheet 1 DemandPPM.
I attach images.

Thanks, Tz

[Greg_Deckler]

@Tiz74 Sorry, having trouble following, can you post sample data as text and expected output?
Not really enough information to go on, please first check if your issue is a common issue listed here: https://community.powerbi.com/t5/Community-Blog/Before-You-Post-Read-This/ba-p/1116882

Also, please see this post regarding How to Get Your Question Answered Quickly: https://community.powerbi.com/t5/Community-Blog/How-to-Get-Your-Question-Answered-Quickly/ba-p/38490

The most important parts are:
1. Sample data as text, use the table tool in the editing bar
2. Expected output from sample data
3. Explanation in words of how to get from 1. to 2.