How to restrict certain offers to a specific group of users in the catalog.
Assigning the User Roles, you can make use of the offering permissions to give appropriate right as per your requirement.
1. Login to Catalog UI - Click Catalog Tab
2. Select your desired offering
3. Right hand side pane - click on Permission Tab
4. Under 'Roles' sub tab uncheck the tick mark for 'Grant All Access to All Roles in All Business Units'
Note: Service Delivery Administrator will be the default Role for all the offerings which is OTB and cannot be changed
5. Go to Groups Tab next to Roles
6. Add your defined Groups to this section and all the members of this group will be able to get the required permission as defined in your roles section.