As Charles said, you can "duplicate" the numbering of style A by creating a style B which is based on style A.
It is required that Style A is associated with a multilevel list as discussed in the article by Shauna Kelly How to create numbered headings or outline numbering in Word 2007 and Word 2010 | ShaunaKelly.com.
__________________
Stefan Blom
Microsoft Word MVP
Microsoft 365 apps for business
Windows 11 Professional
|