Warcraft 3 MODs

I need help editing the war3ft.cfg on how to edit so I can buy more than 2 items. Right now I can only buy 2 and and everytime I want to buy more it said need to replace another one. Some servers I played on has the optinion to buy more than 2 items so I guess it's possible.

Yeah, you have to know how to code to do it first. Then, you will have to change more code than you are probably hoping to change. So, unless you are able to code plugins yourself, I would say "give up".