How divide the polygon 1 between 10 to 43 and 8 to 42 ?
What i want is 3 rectangular polygons (2-6-10-43; 10-8-42-43 ; 8-5-1-42)

If i use divide node, i get 4 polygons (2-6-10 ; 2-10-8-43 ; 8-5-42-43 ; 1-5-42)
And polysplit node doesn't work directly on points.

I know i can delete polygon 1 and make 3 polygons with an Add node, but i want to know if there is a way to do it directly.

Thanks for replies

Polysplit SOP works on vertices (first syntax avb)
http://www.sidefx.com/docs/houdini12.5/nodes/sop/polysplit#parameters [sidefx.com]

so you should have no problem specifying the cuts you want
you can even do that interactively in viewport since Houdini shows you when you are at point

Thanks Tamte for reply.
I will try with other parameters.
Polysplit in viewport doesn't work interactively in my case (and in other cases…).

then just fill in the values
it's not apparent from the picture what vertex number of primitive 1 belongs to which point so you need to have a look, or post the geo