Thanks for your answer, Tobias.
Too bad. It would have been really helpful in my case. ??
Appareantly it seems to be a much easier thing to do with Datatables 1.10 than earlier though but since I’m no expert in Java or PHP, it would still be a bit of a hassle to get it working.
Perhaps someone else have more knowledge and can get it to work?
https://datatables.net/manual/api#Multiple-tables