the one in the right is an inset using the polyextrude node, the one in the left I created the two lines manually.

In my case I need the one in the left to be procedural and to be divided into all connected primitives like in the polyextrude sop, I could easily place edges manually but it is not a procedural approach.

I want to know how to do it?

Here's one approach you could proceduralise:

Slice up a poly in 0-1 terms:

1. Add a Convert SOP. Convert to NURBS surface. Enable 'Interpolate through hulls'.
2. Add a Carve SOP. Enabling first and second U and V, and changing the values, allows you to carve up the quad in percentage terms.
3. Convert SOP back to polys. Set divisions per span for U and V to 0, or as required.