Step 1: Set the Attribute Properties
1. On the Admin menu, select Catalog > Attributes > Manage Attributes.
2. Click to open the attribute in edit mode, and do the following:
a. Scroll down to the Frontend Properties section, and set Use In Layered Navigation to one
of the following:
- Filterable (with results)
- Filterable (no results)
b. Set Use In Search Results Layered Navigation to “Yes.”