I join a small exemple, upper part is the normal result using de tool .
The lower part show the same design entrelaced or natted thanks to adding objects to hide part of the background. How could I get the same directly with the normal tools ?

Something like this?

First of all thank you for your rapid answer. Second comment, you are a genius. I'm not. So i'll take a few hours to understand how you get that result. Wich is ex

I spend some time to try to reproduce your work but I was stopped by the language in the first time (see screen image) , impossible to find your PatheOps custom. So, I downloaded e new version, put it in english. But again I can't find the "Extensions" and "generate from path" etc. Could you tell me how it works in the latest version ? Thank you in advance.

Sorry I send twice the same image. Here is the second one

You are on Mac? If OSX=Catalina & v1.0, I suggest using a dual boot system with Linux &v.92.x. If it's possible on your Mac to use v.92.2, more extensions like PathOps Custom are available. 

Here is a way with Catalina/1.0. using simple Path Difference operation using a rectangle as tool:

http://tavmjong.free.fr/INKSCAPE/MANUAL/html/Paths.html

Thank you so much for your help. Waht you show is exactly  what I needed . Many thanks.

I got it finally ! You learned me something great !