I know how to make a style which can add header numbers to titles like:
1- Compressors (In style I set the numbering)

I would like to know how can I make a double number header as follows:
1-1- Reciprocal Compressors
1-2- Composite Compressors
1-3- ...

Off course it is possible to add those numbers manually but I want "word" to
make the table of content for me and for this reason it is necessary to make
those header by style.
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Very Truly Yours
Rasoul Khoshravan Azar