help in multiple grid formation
 

How to divide the field into equally sized squares in ns2.35?

Short answer: write your code to do it.
Longer answer: we're happy to help, but you have to give us something to help WITH. Read the "Question Guidlines" link in my posting signature...show us the code you have written, the error(s)/message(s) you're getting, tell us what version/distro of Linux, etc.

A web-search of the question returns this and this etc; are those relevant? If not, info on how your wish differs may help clarify.