Sourcing in extended classic scenario

Hello, all

We are using the extended classic scenario in SRM 5.0.

In sourcing cockpit I have the following problem. In spro Supplier Relationship Management/SRM/Server/Sourcing/Define Sourcing for Product Categories I set Sourcing Always Carried Out. From a shopping cart the purchase order is created automatically as the data complete, but I'd like to sent shopping cart to the sourcing, where from a shopping cart create bid invitation or purchase order. How do it?

Please help,

Best regards,

Guzal