You can select additional cross-sell products after you create a master product.
To select cross-sell products
1. On the Manage master products page, select a master product (System Setup > Set up commerce web components > Manage master products).
2. Page through to the Cross-Sell products page.
3. Select a cross-sell product from the Available Products list.
4. Add the cross-sell products to the Selected Products list.
5. Click Finish to save the products.
6. The Manage master products page is displayed.