If you are a Shopify user and have the Modalyst app installed your inventory will be updated in real-time for Retailers.
There are two ways in which you can update your inventory if you are not a Shopify user.
Bulk Editing – After you've added your products you can export them as a CSV. You can then edit that CSV with any changes you made to your existing products, or add new products and import it onto Modalyst. It will automatically update existing products and add the new ones for you.
Individually – products can be updated one-by-one, should you wish to change just a few at a time