Add a Facet to Category Navigation
Add search facets to a Category template.
Complete the following prerequisites:
Create a new facet in the following location:
Create a display name, add the fieldname to have the facet focus on, and then
Open the catalog templates from the content tree at
Open the _Standard Values content pane.
In the runtime search facets, select the facet you created and add it to the
selected list, and then click Save.
The facets you have selected are available on all category
Note: You can use different facets for specific category page by
modifying the Category Search Facets field for that