Untrim single edge on surface?

is there a way to untrim a single edge so i can extend just that edge? ty

At a guess, you’ll need to Untrim while keeping the trim object > edit that polycurve > and Trim again to extend only one edge. If that doesn’t work, ExtractSrf the trimmed surface and Export it to post here if you can.

DupBorder to obtain a polycurve of the boundary of the trimmed surface.
Explode the polycurve.
Untrim the surface
ExtendCrvOnSrf the boundary curves to the edge of the untrimmed surface as needed.
Trim the surface with the boundary curves.

ok, ty

nice, a lot of steps but doable. thank you.

you can try with extendSrf on trimmed edges and/or ReplaceEdge