Step 2: Make the Category an Anchor
1. On the Admin menu, select Catalog > Manage Categories.
2. In the Categories panel on the left, click to open the category.
3. On the Display Settings tab, set Is Anchor to “Yes.”
4. Click the Save Category button.
5. To test the setting, go to your store and select the category in the top navigation. The selection
of filterable attributes for the products in the category appears in the layered navigation.