InfoPath Dev

Thank you Hilary. I fought a bit because i have not been able to find quickly detailed documentation on the preceeding/following-sibling formula but finally i succeeded to do something a bit "sexy" - at least that fit my need. the time for me to clean it up (and anonymize) and i'll attached it to this post for others. thanks ...

Hi All, I have been looking around for now sometime and I desperate to find a way to do the following.  I have my data in sharepoint lists and I would like my users are able to drill down from 'high level' to 'detailled level' (and reverse) like it is done in sharepoint views when I use the "group by" ...