custom Numbering using tags

Hi,

I am on the beta version from Scriv235b-170113.zip

I have the following structure:

PRELIMINARY ELEMENTS
“texte” (done with several documents)
INTRO
“texte” (done with several documents)
Chapter 1 “title”
“texte” (maybe)
1.1 “title”
“texte” (done with several documents)
1.2 “title”
“texte” (done with several documents)
etc…
Chapter 2 “title”
“texte” (done with several documents)
2.1 “title”
“texte” (done with several documents)
2.2 “title”
etc…
CONCLUSION
“texte” (done with several documents)

I use <$hn> to achieve this numbering and it works.
Into the different chapter (Chapter 2, Chapter 3 etc.) I need to number elements with the chapter number+inside this chapter position:
Chapter 1 “title”
1.1 “title”
Special element 1-1
Special element 1-2
1.2 “title”
Special element 1-3
Special element 1-4
Chapter 2 “title”
2.1 “title”
Special element 2-1
Special element 2-2
2.2 “title”
etc…
You see the drill

I tried the format <$hn>-<$n:specialelement>, but it gives me 1.2-1 when 1-1 is expected.
If I use <$parentposition>-<$n:specialelement>, since I have two folders for PRELIMINARY ELEMENTS and INTRO, I obtain 3-1 instead of 1-1.
I don’t know if Compound tags could help, but I don’t understand well their behaviour. (actually the exemple seems a bit short for my understanding :blush: )
What would you recommend?

Regards,
Chris