I have a layer in Illustrator with rectangular shaped picture. Basically, it is a rectangular filled with some more vectors that form the drawing.
I would like to split (or cut or divide) this rectangular and everything inside it into a mesh of smaller rectangular or squares, that I can group and separate.
In other words, I would like to take a rectangular group and divide it in pieces.
Cai's answer works, but in some cases it mess up my artwork. Here is an example BEFORE (the cross is the grid):