How to bulk edit items
How to edit multiple items at once:
From your Shopify store dashboard, click Products.
Select all products.
Click Edit products.
You will see a list of all of your products where you can quickly edit their price and other fields. If you don't see the field you need to change click Add field, and choose the field(s) you require.
With the chosen fields now displaying you can scroll through the list of your products and change any that you require. Click and type in any fields you would like to update.
Click Save at the top right when you are done.