Have tons of products to move to/from certain collection? You're in the right place.
A multi select function in Products help you to manage products in once.
You will learn how to add/remove collection to/from products in bulk, cut down mindless workload.
Add/remove multiple products to/from collections
1. Go to Admin > Products > select the products you would like to add/remove to/from collections > click on 'Manage collections'.
2. Check the collections you would like to add these product to and uncheck the collections you would like to remove these products from > Save.
Tips: You can do this step for multiple collections at once.