Check this asrticle when you can't update the billing contract owner
Product Catalog Price List FAQ
Creating a new Subscription using the Product Look up on the Subscription form.
When you dont get the option 2Add Products" on D365 catalogue, changing these settings will enable that option for you
Currency on the Product Service
How to set up a Power BI Report
How to Clone a Work 365 Instance
How to Create a CRM Instance
By Default Dynamics Creates products in a Draft state. This is important particularly when using the product service.