I specifically need this for Vendors, but I can see how this would apply to Customers and Employees as well.

I want to keep individual Vendors separate, but at the same time be able to aggregate them for reports. For example, I want to know how much money I spend at Starbucks Store #123 and keep that separate from Starbucks Store #124. I also want to know how much I spend at Starbucks in general, so I would want stores #123 and #124 to be under Starbucks (just like how the Account list works). Each individual business has unique addresses and contact information, which I want to keep separate for potential communication with the business.