This is an accepted solution.
Happy to help. You can add products into either a manual or an automatic collection.
Here is a link which will break down the difference between the two and a step-by-step on how to use either of them: https://help.shopify.com/en/manual/products/collections
If you still require assistance or need any other help with your online store, I would be more than happy to help.
Email me at firstname.lastname@example.org