Issue has been resolved after adding the values into the Database tables by vmware engineer team
Insert into real_network_backing values((select NEWID()),0xFBDCEFB3F35A4961AB0D9C7B7583EAF9,0x5A8D7DCF434F444884320A816307F5BC,'dvportgroup-685')
After this i can see the Isolated network shared between the Org-vDC.
Reason:
A-orgvDC created isolated network without shared after this B-orgvDC created and want to shared the A-orgvDC isolated then it will not showing in the vCD