[libreoffice-users] captions and headings

Hi
I'm working on a document that has chapters+sections 00-01, 00-02, ... 01-01, 01-02, ... etc.
I'd like the figures to be numbered just using the first part, ie figure 00:01, figure 00:02, etc. 
With numbering running consecutively through all the 00-xx sections; but i can't figure  (excuse 
the pun) out how to do it. A major difficulty is that the caption category doesn't appear to accept 
spaces or punctuation.
Is there a way around this to achieve what i'd like, or am i perhaps asking a bit too much here?
Thanks
/Gary

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