How to match these two edge

I want to match the pink edge of the larger surface to the red edge so that i can make a chair.
What commend shouldi try ?
Struggled for 2 hours…

Assigned to Rhino for Windows category.

Hello - probably a BlendSrf would do something here, but it will be easier to help if you post the file.


Hi sorry i didn’t upload the file.
Here it is ~Untitled.3dm (1.0 MB)

Something like this?
Untitled_02.3dm (1.2 MB)