Seller selling another brands items, but under their own name?

Sorry for the confusing title, not sure how to describe this in a few words.

Basically, there is a major seller (let’s call them Big Amazon Seller – BAS), they are selling a popular brand’s products (let’s say it’s Disney). The listing is set up this way (example):

Title: Disney Mickey Mouse Plates

Brand: BAS (Visit the BAS Store)

Ships from: Amazon.com

Sold by: BAS

The only seller on the listing is BAS. They are selling a brands’ product that I can source from an authorized distributor. But technically, the products’ brand is BAS.

Questions:

1. If I source the Disney Mickey Mouse Plates from an authorized Disney distributor, can I also sell on this listing?

2. When I go to add the product to my account, it says I need to apply to sell BAS products – requesting an invoice. The invoice will say the underlying brand (ex. Disney), it won’t say BAS because it’s not their product. How does this work? Would I need to create a new listing for the underlying brand (ex. Disney)?

Looking to understand this setup better – thank you.