Hi

Shidharta

Administrators and catalog administrators can manage multiple service catalogs,to provide services to different organization, such as IT services, human resources, and facilities management.

Go through the bellow link, it may be help full to you,

http://wiki.servicenow.com/index.php?title=Managing_Multiple_Service_Catalogs#gsc.tab=0

Thanks & Regards

Haseena

                                                                          PS: Hit like, Helpful or Correct depending on the impact of the response