Currently, the ability to include your vendors name on the Product and Services page is not available. What you can do is to run and customize the Product and Service List Report to include the Preferred Vendor column.
Go to the Reports menu.
Scroll down to the Sales and Customers section.
Select Product/Service List.
Click Customize at the upper right.
Select Rows/Columns, then check the Preferred Vendor box.
Click Run Report.
To learn additional insights about managing your Product and services, you can check these articles: