Remove a piece of coube

Hello I have a small problem on Solidworks

Let me explain, when I create a boundary surface from curves, I sometimes want to 'remove' a piece of this surface, but when I remove it using 'restrict surface', the curve created is still and I don't know how to remove it, I don't know if I was clear, so I add a photo

so here is my surface

 

 

and when I cut it the bottom curve remains present I don't understand

Thank you all for your help

Hello

 

It's normal that the curve stays because you don't delete the sketch but only the function. If it's just visual, you can simply hide the curve by right-clicking on it.

1 Like

Thank you for your answer effectively hide it or the problems I was just afraid that by hiding it I would have problems later on

Thank you