Price list and BP

Hi,

Please assist on this:

I have two kinds of suppliers- 1. Supply stock items e.g. medicine

2. Supply service items that are basically expenses e.g. catering services

I have 3 price lists - 1. Cost Price (for stock items)

2. Selling Price (for stock items)

3. Expenses (for service items)

How do i come about a situation where the supplier for stock items also provides assets such as medical equipment and maintenance services. How will i incorporate price lists and Payment terms for those kind of suppliers?

Thanks & Regards

Aziz Taibjee