Getting Interior walls only BUT as solids

Hello,

I’m trying to extract only the interior walls from the Wall category but only in a SOLID output.
here is the script that I have below.
I need to have the same outcome as Furniture line (above Wall) - which is in Solid.

thank you very much for your time

You want to filter the wall elements, not the parameter values. Then after filtering get the solids of the included walls. Graph was a bit tight but did my beat to markup the steps in blue, then purple.

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Try Like this

Filer by Function .dyn (14.4 KB)

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both works perfectly thank you everyone