To organise product into different collection follow these steps :
From the left sidebar select “Product Listing”
Click on the "Collection”.
A list of collection will be displayed if any otherwise click on “Add New Collection” .
Fill in collection details - Collection Title, Collection Description
Upload Collection Images
Add products to the collection.
Click on “Create” button.
You will be redirected to collection page a your collection will be created.
You can manage (edit, delete) the collection by clicking on “Customize” button.