specific group buy only from inventory

Hello, this is my first time im using cs-cart and i have a question.

Is there a way to specific group buy only from inventory and not from stock?

As I understand inventory’s items is not equal with stock’s items. All I want is to set stock items for customers and inventory’s items for partners. The product is the same but partners have a different price list and limits for order.

Not sure of your usage of the terms inventory and stock. There is only one value for quantity on hand and that is the inventory value. If what you want is to define diffferent prices by the group a user is a member of, then that is easy. Just go to the “Bulk pricing” tab on product detail page in your admin panel and setup whatever pricing you want for whatever groups you want.