Hi @JDG ,
Do you want to show the projects contain the selected situation in slicer? Here I suggest you to create an unrelated dimsituation table for slicer and then create a measure.
VAR _SELECTVALUE = SELECTEDVALUE(Selection[Value])
VAR _PROJECT_LIST = CALCULATETABLE(VALUES(Data[Situation]),ALLEXCEPT(Data,Data[Project]))
IF(_SELECTVALUE IN _PROJECT_LIST,1,0)
Add this measure into the visual level filter of table visual and set the measure to show items when value =1.
Result is as below.
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.