How to close vector

You will need to subtract that from the pocket geometry.

For the underlying principle see:

First, open the file:

Second, select the geometry which makes up this region:

and duplicate it:

and then if need be, draw in geometry where things will need to be cut/trimmed:

Select everything:

and use Trim Vectors:

to allow one to click to remove portions which are not wanted:

OK

Use Join Vectors to close things:

Yes

shift-click to remove the closed geometry from the selection:

Delete

Then assign a toolpath:

Attached as a v7 file.

Nathan James Sign_v7.c2d (1.6 MB)