Previous to this new feature, Veracart was limited in how quickly you can add a cross-selling item to a large number of products at once.
Say you have a Product that you want to have cross-sold across many different Products. This new feature gives you the ability to select a Product, then select which Product(s) you want it to be cross-sold with.
Instead of a "many-to-one" approach as we have currently available on the Item Editor page, we are enabling you to use a "one-to-many" approach by attaching the Product directly to any number of Products, all at once.
This will help you save time when attaching a particular product to be sold with many products in your store.
To use go to Products > List Items(Items/Packages) > Click on the Blue + next to any product you want to add as a cross selling item to many products.

Once you click the blue "+" icon, a box will pop-over the screen. Use the categories on the left to select the products you want the item to be cross-sold with.
