 Requirement:

Group products in collapsible sections based on Product Family in the Add Products page.

 Solution:

Set the Product Results Group Field Name in Additional Settings to Product Family. This groups products by their Product Family in the Add Products page.

 Why Other Options Are Incorrect:

A: Solution Groups apply to Quote Lines, not the Add Products page.

B: Adding fields to the Search Results Field Set does not enable grouping functionality.

C: The Product Search Plugin is unrelated to grouping.

 Salesforce CPQ Reference:

Configuring product grouping is detailed in CPQ Product Search and Results Configuration ​.