There are multiple ways to add items to a collection:
Important All items that use the tags that you specify in the tag list are automatically added to the collection. If you share the collection with other users, you automatically share all of the items.
Tip Create multiple tag lists if you want to create an OR condition, where items tagged with either "x" or "y" are added to a collection. For example, if you want to add all items tagged with the phrase "Science and Technology" and either "Green Energy" or "Solar Energy", you should create two tag lists. The first tag list should contain the phrases "Science and Technology" and "Green Energy". The second tag list should contain "Science and Technology" and "Solar Energy".
Links:
[1] http://staging.docs.d2l/en/taxonomy/term/3