How to get the measure total at row level for another measure calculation in DAX?

Hi There,

Using DAX, I am trying to get an expression for a calculated measure as follow:

So basically, I would like to get the AMeasure total highlighted in yellow in the A2Measure calculation:

Smeasure -(Ameasure total * WMeasure) where Ameasure total is the one highlighted. 

I think my question would be how to get the total of a measure in order to used in the calculation of another measure.

Thanks and best regards,

Joss