Possible to switch from UCLA Econ to BizEcon?

I’m still waiting on Haas to come out, but I applied to UCLA as an econ major and got in. I did not apply BizEcon because I did not have room for managerial accounting on my schedule. However, I did take Financial accounting and received an A. I do not think I will have difficulty getting an A in managerial econ if I take it over the summer.
I have straight A’s in all my classes, and managerial accounting is the only class for BizEcon that I haven’t been able to take so far.
Thanks everyone for your help and congrats to all future bruins!

Also just to clarify, signing up for myucla to check my provisional accounting letter doesn’t necessarily mean I am committing, right?