one solution is
- to make an export with baan tools (ttaad4226m000)
- to make an import with baan tools (ttaad4227m000)
and after start the session to change the compnies number in the baan tables, this session is tfgld9000m000, tfgld9001m000, tfgld9002m000 AND tfgld9003m000 - Or you can run the tfgld9004m000 wich are then combinaison of the fours sessions.
then disavantage of this solition: if your live companies is big, the export/import with the baantools can be very long.