Hi ghan,
What Burr is putting forward is the un-trimming of a trimmed surface.
On the example you show, you would first need to "separate" the solid, then select the surface edges, then delete them, which will put the surface back to untrimmed, then rejoin the required surfaces (some re-trimming may be needed depending on the other surfaces it is meant to join for the solid,.. and the extra surfaces made that join those holes will have to be deleted.
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