AutoCAD Visual LISP / AutoLISP :: Divide Big Region On Lines Intersections

I need a easy way to create a lot of small regions, or divide a big region in lines intersections, or a fast way to pick points inside objects.

Its like that:

imagine that you do 100 horizontal lines and then 100 vertical lines.  Now you have 10.000 squares. i need a fast way to make a region in each one of then.

So its too much trouble to pick points inside each one of then. i need to divide a big region or a fast way to create Plines or objects with the little squares. And i cant use array because they aren t regular squares.

Its something that i do often, its not a one time thing. This is necessary in structure analysis modeling, i export this dwg to a dxf file, that i use on a finite element program.

i never did a lisp before.