David’s article was helpful however I ended up solving my problem differently altogether, using 2 paragraph styles and 2 and 3 level lists. Here’s how it worked out:
Level 1 List Style: Basic 2-Level list with the number as ^#.0^t, continuing from the previous number.
Level2 List Style (based on level 1 style): 3-level list with the number as ^1.^3^t, continuing from the previous number
These make a list like:
1.0 Level 1 list style
1.1 Level 2 list style
1.2 Level 2 list style
2.0 Level 1 list style
Etc.
In playing around with multiple styles I ended up also finding a very easy way to force InDesign to start a numbering level at 0 instead of 1.
In the dialog box where you have the option to “start numbering at”, change the numbering to start with 0. Then change the option back to “Continue from previous number”. In the greyed out box you will still see a “0”, and if you have a 1-level list with the numbers as ^#, they will start at 0.
