You can allow your customers to set purchase quantities through a text input on the basket page. You can change the quantity selector in your Store Preferences section. This allows your customers to purchase more than 20 of your product at one time (which is the current limit on the dropdown option), but no more than your stock limits if you have your products set to mark as Hidden or Sold out on Stock Zero field.
You can also add a text quantity input on the product page.
- Firstly log into your Dashboard and go to the Dashboard -> Shop Settings -> Store Preferences page.
- Under Quantity picker type, select Text input. This will save automatically.
- Check your basket page to make sure this works as expected.