Wish - Surface Trim History feature

Hi All,
I think if there is a history list in rhino to record the geometry’s trim boundary,we can achieve something like solid kernel application did,like delete fillets.
image I have some srf or ploysrf to have fillets,but after further development,I found the fillet size is too large,then I can go back to these srfs’ early trim states,and refillet them.

In V6, solid fillets are now to some extent history enabled. --Mitch

Thank you Mitch,I’ll find it and have a try.