function to blend 2 playlists or split 1 into 2

[Frankelstiltskin]

Let's say I want to listen to rock, but I have 2 playlist: 80s rock and 90s rock. I want to listen them sometimes separately , sometimes together. Is there any function, like blending 2 playlists, or split the big playlist into 80s and 90s?

[BartoszKranendonk]

You can easily add two playlists together by first creating a new playlist (80s and 90s Rock). Then click the three dots at the top of your first playlist (80s Rock), scroll down and click Add to other playlist, and add to the new playlist. Do the same for your second playlist (90s Rock) and you're done.

The only thing is: this new playlist will not update if the others do. 

So I would love to see boolean operators for playlists, to make more interesting en specific queues easily. 

[Dub2Dat]

You can also do drag and drop.  Create a new playlist.  Open your 80's list.  Select All. Click, hold, drag 80's list to the new playlist, release click.  Open 90's list. Select All. Click, hold, drag 90's list to the new playlist, release click.