Internal Transfer/ Double Major

Hello! I’ve been accepted to CAS for class of 2030. My plan has slightly changed, and I’d like to see if it’s possible/if i’m understanding the process correctly.

I’d like to double major, if possible, theater education and biology. Would I need to internally transfer to Steinhardt, declare my major for Theater Education, and apply to double major at CAS? I understand most of this would be up to my academic advisor, but I’d like to see if anyone has had any similar experiences/if I’m understanding the process correctly.

Thanks!