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That would be the method you should use for the side head numbering, yes. This step controls the action of the counters -- whether they're incremented, restart, or contain a custom text message.

The counters are actually invoked by the paragraph tags, which also control the formatting and the way the counters are presented in the document. One thing that you should do when setting up numbering in your paragraph tags, that is often overlooked, is to specify a numbering stream. Frame has 57 streams that can be assigned to track different things. A particular stream is invoked by starting the autonumbering string with a letter and colon -- A: or a:, for instance -- and then the numbering counters. Some people might use c: or C: for chapters, H: for heads, or S: for a sidehead.

So two steps, with different purposes.

Art