I may be wrong, but I don't think Square does that natively. There is a work around, it will take a little time at first to setup, but will be easy to maintain afterwards.
1. Go to the Online dashboard/items/site categories.
2 Click Add Category.
3. Name that category Brands or shop Brands.
4 Then make a subcategory for each brand. For example, Nike, Converse, Adidas
5. Go back to your Online dashboard/items/site items.
6. This option you can click an item individually or do it bulk.
6a. Individually: select each item individually and scroll down to Categories then click choose category and add that item to what brand you want.
6b. Bulk: check each item that is the same brand, then click Bulk Edit in the upper right hand corner and select Add to Category.
7. go back to the online dashboard/website/edit site, Click on Header, then Edit Links.
8. Click Add Navigation Link, when the pop up box appears , in the Link to section click the drop down menu and select Category, below that in the Category Page type in what you named your category: Brands, Shop Brand...etc and click on it.
Then you can click and drag it to any position you would like.
This sounds long winded and sorta complicated, but it is fairly simple, if you have added any categories before, then this is exactly the same way.
