I have talked with WHCC and the fine folks there told me that I can leave my current account as personal and create a new account as business.
The "business" account would be tax exempt while the "personal" account is not tax exempt. So when I order prints for my own use they will charge me the 6.25% sales tax and when I order prints to resell to customers (through my new business account # with WHCC) they don't charge me sales tax.
That will make things a lot easier!