[Geoff Bacon]

I use collections to separate the groups I play in and don't see why it wouldn't work for you. Suggest  you give it a try

To set it up,
1 display Songs tab
2. long press one song until it displays a check box
3. Check other songs in this group
4. Edit
5. Specify the required collection name.

Repeat fror the other collections.
Note: you can use the filter mechanism to exclude songs that exist in one or more collections. This makes selection of the remaining songs easier. Likewise, if your songs all contain a specific word eg fake,  you can limit the display to those songs.

A song can be in more than collection.

Should you find rhat collections aren't what you want, you can just delete them (the songs will still exist as they can only be deleted from the Songs tab).

Another alternative is to use the companion to perform the collection manipulation - this allows common window mouse operations to select multiple items

Geoff