Can i do a modifications on static meshes?

i m asking if I can modify a static mesh specifically subtracting

It’s not possible to edit the Static Mesh when imported using any way you would like the BSP brushes.

You have 1 of 2 options:

  • Create your static mesh the way you want in a modeling program.
  • Create you BSP and use the additive and subtractive brushes the way you like. Then select the additive and subtractive brushes and convert to static mesh.

Once I have converted it to a static mesh, how to set the options so that light is rendered on the new static mesh, mine come out all dark and washy after building lighting.

Cant seem to find any tutorials on it.