Say if you want to make a new tag 2.0.2.23 off the 2.0.2 branch:

  svn cp https://origsvn.digium.com/svn/asterisk-gui/be/branches/2.0.2 https://origsvn.digium.com/svn/asterisk-gui/be/tags/2.0.2.23
  svn co https://origsvn.digium.com/svn/asterisk-gui/be/tags/2.0.2.23
  cd 2.0.2.23
  ./make_guiversion
  svn commit