Denis : Waouh, very useful, merci
Tony: to give javascript a chance I will ask the forum in 2016 for aircraft/theater seat selection and reservations using LimeSurvey

Note: I suppose it's ok to use the demo instal like I did; if not just say it.

tpartner wrote: ??? How does that work? Surely you should need the entire sub-question code when using a sub-selector with that.

No .

sq_X - where X is a row or column identifier. Only sub-questions matching pattern X are selected. Note that search is done on complete code identifier, then sq_X match and include subquestions nX, X, Xn (e.g. if you use sq_1, subquestions a1, 1a, 1, 11 or 001 was included). Put attention at dual scale question type where subquestions code are QCODE_SQCODE_1 and QCODE_SQCODE_1 and to ranking question type where subquestions code are QCODE_1,QCODE_2 ....