To achieve the following goals:
Branch Office accesses resources in Head Office the VPN connection is used.
Branch Office accesses other resources such as Internet, no VPN is used.
How to configure the VPN connection to Head Office in Branch Office?
VPN connection properties -- Internet Protocol (TCP/IP) --Advanced button
-- uncheck "Use default gateway on remote network"
If you leave the "Use default gateway on remote network" selected, all communication from Branch Office to outside will go through VPN to Head Office, including the Internet access.