I have 1 portal with many child portals. Each child portal is a
separate customer. I would like to create "line item" invoices for each
customer. The line items would include services and catalog products. I
would like to create the invoice on the parent portal and it would be
displayed** in each customer's portal (i.e. Users in certain Roles would see
the invoice and pay it) is this possible?

I also would like a shopping cart/catalog for each child portal's members.
Each customer's catalog can have different products and prices.

Any ideas if this is possible w/ the Store module? I'm an intermediate sql/asp.net/vb.net developer if this would require customization.

** I would like to use SQL Reporting Services to display the invoices on the child-portals.