For branching browse schemes, use a different prefix for each branch. You can specify a prefix in the configuration file, in a marker, or in a specific configuration file, as for start numbers (see §17.13.3 Setting up multi-file browse sequences):
[BrowsePrefix]
; overrides the [HelpBrowse] Prefix for the file named
; filename (no extension) = prefix string
; is overridden itself by usage in [HelpBrowsePrefixStyles]
[HelpBrowsePrefixStyles]
; Topic Browse can have an optional prefix