Hello,
In this case, you would have to work on the Steps below:
First you would have to check what version of SEPM are you both carrying. For replication, you would need same version of SEPM.
Later you can check this Thread to work on :
https://www-secure.symantec.com/connect/forums/merge-2-sepm-servers
Incase, you want only 1 SEPM to remain and all this clients to report to the SEPM of your company, then you can use the SylinkReplacer Tool which can get all the clients to report to your company SEPM.
Here is the Link to the same:http://www.symantec.com/connect/downloads/sylinkreplacer-tool-connecting-sep-clients-sepm
Hope that helps!!