Import Firewall Policies send to Select Options of replace

Hi,

I'm newbie using SEP (Symante Endpoint Protection) for ATMs

I'm try import policy of firewall, but when click import, the system ask me (Network Service Group allow inbound ICMP Echo Replay already exists. Please select one of the following options. -use existing policy-Overwirte existin policy-Create a new policy)

I just need import, and later modify for use. I´m not do it change to this new policy.