Free Items with $0.00 price from Catalog

Hello SRM Guru's,

SRM 5.0, server 5.5, classic scenario.

I have a requirement to create Purchase Orders for supplier catalog itms in SC with $0.00. Currently, I have a split order whereby item's with price greater than or equals to $0.01 creates purchase orders and items in the same SC with $0.00 create requisitions.

I will like to know the procedure to create a single PO for a shopping with catalog items and pricing of $0.00.

Regards,

Wale