Adding playlist to a playlist

[rolandmedvegy]

I would like to suggest a quite useful feuture. Which is selecting an entire playlist by one click.
I have 8 holiday playlist which all contains 100 songs each and I would like to have an ultimate one with these 800 combined, but my problem is adding 800 songs one-by-one is time and effort consuming.
Help me out.
Roland

[Ximzend]

This is already possible.

On desktop:

1. Click on a track in the playlist you want to copy.
2. Press CTRL+A to select all tracks.
3. Press CTRL+C to copy the selected tracks.
4. Go to the playlist you want to copy the tracks in.
5. Press CTRL+V

On mobile:

1. Open the playlist you want to copy.
2. Press the 3 dots at the same height as the play button.
3. Press Add to other playlist.
4. Then, press the playlist you want to add the tracks to.

[rolandmedvegy]

Doesn't work on either. I don't even have that option:
Make this feature available in Hungary please.