If you have had a chance to work on magento, you might have seen collections in there. In magento collections are based on sorting by attributes. It works more like virtual categories. Here you may see how it works in Ergonode.
Let's start from creating a collection. You do it by choosing Products/Collections in the Menu.
Then after pressing 'New product collection' you need to give it a name and choose if you want your collection to be up-sell or cross-sell (check the bottom if you want to know the difference).
After your collections is created you need to do nothing more, but add some products. To do that you have two ways.
One is using SKU, which is usually the most accessible way. If you have a list of SKUs of your products, just copy them and paste here:
The other one is using segments.
Now with all the tips you may create any kind of collection you wish. It may be not only such obvious thing like 'Winter Collection', but also 'Sale' or 'Promotion'. Usually it is worth having when you just want to have all the connected stuff in one place. In case of 'Winter Collection' you simply add products that are designed to sell during winter season. If you wish to have 20% discount on the group of products, you simply create 'Sale' collection and customize it.
Let us give you another example of what you can create.
Imagine having 4 people working on the same environment, complementing 4 product's information.
Having the products added to the collection you may easily take a look on what stage are they. In this way you just follow the current workflow of your team. Collection visibility This switch enables visibility of the collection from the product card. This option will be soon sunset.
As you can see, there are multiple ways of using collections in order to combine products with each other. It is completely up to you for what purpose you will find them helpful.