To add products to your collection, go to the Brand Detail page of the product you want to include. Click the All button next to the Products heading to view all products from that brand. On the product page, click the Save icon next to the product, and click the New Collection button to create a new collection or use the '+' button to add the product to an existing collection. You can also multi-select products to add them to your collections in bulk.
You can go to the Collections page and open the All Saved Items section for a specific brand. Click the three-dot menu and select Select to choose the products you want. Then, click the Add to Collection button. Then. click New Collection to create a new one or use the '+' button to add products to an existing collection. You can also use multi-select to add multiple products at once.