Credit Exposure between Parent and Child Customers

Hi Gurus:

We are having unique requirement from sales team.

We sell our products to multiple customers. There are few customers where parent child relationship exists. All payments are received from parent accout whereas invoices are generated for child customers. Our sales team has approval of credit limit for parent customer which they want to allow for child customers.

I think this can be done but unable to find the correct document or parameter to define this setup.

appreciate if someone can share his/her experience to solve above requirement.

Thanks

M. Ibrahim Memon