The Add and Add+ buttons appear on screens where you might want to create a series of new items, like several products, categories, or customers. They work the same way regardless of where you encounter them.
Enter the basic information for the item you are creating. Then click Add to create the record and continue working on that same record or click Add+ to create that record and move on to a new blank form where you can create another item.
For example, enter the information for a new product on the Add Product screen. Click Add if you want to add a product to the store database and continue working with that same product, to upload images, create related products, and so on. If you want to just save the basic product information and go on to create another product, click Add+. You can return at any time to fill in details for any new items you have added.
Click Add to save the information you have just entered and continue to work with the item you just created.
Click Add+ to save the information you have just entered and go on to create another one.