The "branch" command:

Usage: fossil branch SUBCOMMAND ... ?OPTIONS?

Run various subcommands to manage branches of the open repository or
of the repository identified by the -R or --repository option.

   fossil branch new BRANCH-NAME BASIS ?OPTIONS?

       Create a new branch BRANCH-NAME off of check-in BASIS.
       Supported options for this subcommand include:
       --private             branch is private (i.e., remains local)
       --bgcolor COLOR       use COLOR instead of automatic background
       --nosign              do not sign contents on this branch
       --date-override DATE  DATE to use instead of 'now'
       --user-override USER  USER to use instead of the current default

   fossil branch list ?--all | --closed?
   fossil branch ls ?--all | --closed?

       List all branches.  Use --all or --closed to list all branches
       or closed branches.  The default is to show only open branches.

Options:
   -R|--repository FILE       Run commands on repository FILE