How can I edit an existing surface boundary?

[alansanudo]

I have a surface that I created by joining to surfaces, and now I want to reduce my boundary, how can I edit it? 

thankyou:)

[alansanudo]

sorry I said boundary, but its border! thanks

[Jay_B · Accepted solution]

If you have a polyline border of surface just grip edit it as needed and rebuild surface.

If you don't have a polyline of surface border to edit click on surface and choose "Extract Objects" from Surface Tools panel on Tin Surface contextual ribbon, select "border", grip edit the resulting polyline boundary>rebuild surface.

[alansanudo]

VERY HELPFULL ANSWER! RESOLVED THANKS ALOT!

[b.herronN65PF]

Did you miss a step? I extracted the 3D polyline and grip edited it, but my surface boundary will not change.

[josh.dicerboPJBKG]

Watch this video

https://www.youtube.com/watch?v=ONHzyi0khj0&ab_channel=CADMasters