iwork Pages - custom numbered bullets?

I originally posted this in the newbie forum before I realized it would be better posted here.

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I switched to a Mac a year ago and am still figuring out all the nuances.

When in Pages, I would like to create custom numbered lists. For instance, 1, 1A, 1B, 2, 2A, 2B. I figured out how to use the style drawer and save a particular format (increased indent, increased space to text), but cannot figure out how to change the numbers themselves.

What am I missing?

Thanks,

jsamt