calculate with text filter

[mhendel]

Hello,

I have two linked tables : 

The first one : 

For each Projects code, "phase par défaut" is unique.

I have the second one called budget, contains an amount of hour per phasis.

Tables are linked by code de projet and i have a slicer with that code.

I have to extract the amount of hours for the default phasis, with a measure.  

Someting like : budget current phasis = calculate(SUM('budget'[heures prévus]),(a filter to find what i want"))

My problem is that i can't find the way to filter that...

Can you help me ?

Thanks!