Hi,
I think the Best way is to use Webservices.
Online Help:
http://help.sap.com/saphelp_byd1402/en/PUBLISHING/IntegrationScenarios.html#Subsidiaries
Business Center – ByDesign for Subsidiaries (login required):
https://wiki.sme.sap.com/wiki/x/fgg4Dw
I hope this will help you...
Regards manfred