I just realized my answer might not have been detailed enough.
I am uploading a PDF network map at its most basic level.
In this PDF example, customers 1 thru 3 are all PI. They have their own BGP AS and assigned subnets that are independent of Awesome-Net and its upstream providers.
Any customers that would be off of R1 in the PDF, all use IPs assigned and provided by Awesome-Net. Those IPs are indepentent of Provider1 and Provider2 (ISP1 and ISP2 in the PDF). They are owned by Awesome-Net and are a parts of its BGP AS.
Does this tell you what you need to know?