How do I grab a wall based on elevation in RhinoInsideRevit

I want to select the walls of this layer based on the elevation

If you mean filtering wall by their level, you can use Level Filter.

If you mean filtering walls by their Base offset value or any other parameter value, you can use Equals Rule and Parameter Filter combination.

Can’t really understand what you want to achieve. Please share an image or the file so we can better help.

Here is a quick definition that selects the Walls based on a Elevation.

That’s exactly the result I want!
Thank you very much