How to cut the excess?

[ArKeithECT]

[DaveR]

What is the excess? What is it that you want to keep?

[ArKeithECT]

I want to cut this

[DaveR]

Select the geometry of the gridded surface, right click on it, choose Intersect Faces>With Model and then erase what you don’t need.

BTW, 2026 is not an operating system. Please correct your forum profile.