If you want the numbers to restart after each 'subheading' then the subheading style should be level 1 in the outline numbering series. This will allow you to have the lower level list items automatically restart rather than having to add a local paragraph setting to do this (which will then be ignored in the master).

Outline list numbering can be made to work but I believe that you should have macros to back that up and repair things when they don't work as expected.

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Andrew Lockton
Chrysalis Design, Melbourne Australia