[Freesurfer] how to shrink WM surface in one region

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Hi everyone,

Very quick question - I need to shrink the white matter surface in a very specific (constrained) region. Can you please confirm that the right way to go about this is to (1) manually remove voxels from the WM volume in freeview, then (2) save edits on that WM volume, and then (3) run recon-all?

Specifically, re: #3 - many brains also need control points, so I'm running " recon-all -autorecon2-cp -autorecon3"

Using this command structure, I'm not seeing that any of the edits I'm making to the WM volume are influencing the white matter surface line... Only the control points.

Thank you in advance, Lara