How to add Sort By Brand option to Items in PLP Page

In PLP its show option sort by Brand option while click on that items of that brand will show.

Steps:

Step 1: create a custom Item name it as CUSTOM BRANDS and type as List/Record and add list of brands

Step 2: Add CUSTOM BRANDS to website Search Index > Sort Fields

Step 3: Add Brands to respective items which is showing in custom sub-tab.

Step 4: Make cache Invalidation Request.