Please elaborate on your question.
As I understand you have two embedded vCenter appliances, and you have to manage and link them.
if these vCenter appliances are 6.5 u2 and later, you can link them as per the Embedded Linked Mode option. these link helps you on managing these two vCenters from one point of view.
for more information about embedded linked mode, check the following: vCenter Embedded Linked Mode for a vCenter Server Appliance with Embedded Platform Services Controller