Hi Matadem,

re:
> and I want to split the model into squares

To split a model into square chunks, draw one square of your target size:




Select it and run Transform > Array > Grid. It will ask you for the number of copies to make, the default is to make 10 in x and 10 in y.

For the spacing pick the first point here:




And second point here:



You will now have a grid of squares, position your object within it and select your object:



Run Construct > Boolean > Intersect, then select the squares and you'll get split up pieces like this:



Hope this helps! - Michael