How to use only filterd measures in a visuel in Power BI

Question

I have a table [Exhibitor] with two columns "Exhibitor ID" and "Booth Space m²".


I have two Slicer "Area Cut of - A" and "Area Cut of - B" where I can set the cat of for a classification. They are "what if parameter" 'z_Booth Space CutOff - A' and 'z_Booth Space CutOff - B' that are awailable in the following two measures:

Booth Space A CutOff = min('z_Booth Space CutOff - A'[Booth Space CutOff - A])
Booth Space B CutOff = min('z_Booth Space CutOff - B'[Booth Space CutOff - B])

What I need are two more measures Measure Clas A and Measure Clas B (it can not be a calculated columns) that I can use in a visual to sum up how many exhibitors are in the Classification A or in Classification B.

The final table visual should look like this:

Since there are no other values of the [Exhibitor] table used in this visual I need the measures to do the calculation and grouping. How should I create the measures and how should I set up the visuals configuration?

Can anyone help? Please let me know.