You can add choices like Size or Color to a product from the Store manager:
- In the Website Editor, open the Store page and click the Store button.
- Go to All Products, select the product, click the 3 Dots icon, choose Edit, then open the Options tab.
- Enable Product Options and click Add Option.
- Enter the option name(s) you want (for example, Color or Size).
- Use the Pencil icon to edit the options and manage variants/stock levels.