Mix two lists

[arxibo]

I've been using spotify and have a question regarding playlists:

You can combine multiple playlists at once?
Example: I have two playlist with 20 topics and other with 10, I want to generate a single list of 30 issues, the only way I know is to go one by one with the themes and adding them to the other and then remove the first playlist. This way is cumbersome means.

You know another way?