Subtract Triangulations

On the Triangulation tab, in the Split/Merge group: Click Subtract Triangulations to subtract one triangulation from another. (Ctrl+T,K)

Do the following:

1. Select the input triangulation.

2. Select the triangulation to subtract:

   

3. Click Apply to perform the subtraction:

   

   Check that the result of the operation is what you expect. If necessary, use CTRL+Z to undo.