I need to add an explanatory heading common to all subquestions in the array - see attached screenshot.
I saw some solutions for older LimeSurvey versions, but they do not seem to work with my version 4.3.15.

Hi,
please never say "I saw some solutions, but they do not work".
Show us what you tried, so it is easier for us to help. (at least try to help).

You see, I used this "2-years-old" solution
[url] forums.limesurvey.org/forum/can-i-do-thi...lls-in-arrays#183946 [/url]

and got his in 5.0.1
 

Joffm