New Amazon Seller question…

Went through the process of setting up LLC and trademark through IRS to submit to Amazon. On several occasions speaking to customer support I expressed that Im interested in selling large amount of units and all inquiries pointed to creating a business account.

My question is can I still use the business account to sell my inventory or do I now have to revert to a Seller account? If so, how do I actually go about doing that. Thanks for any leads guys