Hey guys, I was accepted to Berkeley for LAS (i put economics on) but I want to be in pre-haas and apply for haas. Is there any way I can change it so I am in pre-haas? This is a stupid question but thanks 
It does not matter. If you matriculate, you will be L&S undeclared. Then, like all other L&S undeclared students interested in business, you take the business prerequisites and apply to the business major in a competitive admission process.
http://www.haas.berkeley.edu/Undergrad/ucb_admissions.html
@ucbalumnus thank you! do pre-haas students have an advantage? Will it be easier for them to get into haas?
No. Regardless of what intended major an L&S frosh indicated, s/he is just another L&S undeclared student for the purpose of applying to the business major when it comes time to do so (usually in one’s second year).