Can you provide us some more details?
Approximately how many computers will be present in each location?
What is the bandwidth present and what is the current usage of it?
If you do not have not much clients you can go for GUP
For more information refer below doc
Symantec Endpoint Protection 11.0 Group Update Provider (GUP)
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If you want manage the clients separately in each location you can install independent SEPM ( Symantec Endpoint Protection Manger)s,i.e.Install in every location as first site. .then install a live update server in your main office and point your SEPMs to download Updates from this.
For more info refer below article
Installation and configuration of LUA
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If you want to manage the policies centrally and having more clients which is connected across a wan with low bandwidth do as follows
How to Perform Offline Replication between 2 Remote Sites when normal replication is failing due to Bandwidth Issues.
For replication refer this doc
Replication partner set up
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Have a look in below articles also
Implementation approach for Symantec endpoint protection
Best Practices for Deploying Endpoint Protection
For any clarification pls revert back...