Hi Kiran,
Since you have 2 SAP servers and as you mentioned "server system Name and system number and sysID is different" you can create multiple business systems.
--> You have already 1 technical system and its corresponding business system [BS_GRPXXX] SAP 6.0 in your landscape, create one more technical system with the technical details of SAP 4.7 system and derive business system from it.
Check the below link for your reference.
http://****************/Tutorials/XI/SLD/Index.htm
Regards
Bhargava Krishna