Merge cylinder with terrain model

I want to draw a round hole (yellow cylinder) in a terrain model. I.e. the upper border of the yellow object should cut off according to the terrain model (brown). As of now, the brown terrain model consists of regions.

How can this be done?

Thank you for your help!

Comments

  • Use the DMSTICH command to create a Surface (brep) by selecting all the regions.
    Then use the SUBTRACT command to subtract the cylinder from the region.