For unnamed fields to work, you have to make sure that there are no "intervening" lists, and you may also have to specify the numbering level for each field that you add. You can do that by manually adding the \L switch (followed by a number) or you can right-click the LISTNUM field and choose Increase Indent (or Decrease Indent), which would accomplish the same thing.

The way you are already doing seems to work, though, so why not continue doing that? :-)

__________________
Stefan Blom
Microsoft Word MVP

Microsoft 365 apps for business
Windows 11 Professional