Question about fill regions

Hello everybody, I have a simple question about fill regions. In the pic below I show my goal that is fill the region that I painted with green.

cadeira.3dm (24.2 KB) (2.0 KB)

hi Leo,
you forgot to save your curves:

if they are in the same plane you could use boundary surface component

cadeira.3dm (23.3 KB) (3.5 KB)

I’m apologize for my fault Baris! :grin: Here are the correct archive.

Boundary Surface


Thanks man!!!