BE is capable of many forms of notification including SNMP, but I'm not sure why you'd consider this as an option on top of or before considering the other options (SMTP, MAPI, SMS/TXT, PAGER, etc.). Nonetheless, it's a pretty straightforward process (if you have some level of experience with all three products). You didn't mention what version of BE and Windows so I'll assume you're not working on dinosaur products.
You'll need to install the SNMP System Service on the Windows Server that runs BE and configure accordingly (assuming you are using BE v12.x or higher): http://seer.entsupport.symantec.com/docs/315587.htm
NOTE: In the last step of #1, the trap destination is the PRTG probe device(s).
Once that's completed, you need to add the SNMP TRAP RECEIVER sensor to the one or more systems running PRTG (only those systems designated as a probe device are capable of receiving SNMP traps).
NOTE: You'll want to consider the many OIDs that BE is capable of using; you can find these in the BE Help utility or via the Internet (too many to include here).
As with anything, be sure you test the results. Not knowing how big the environment is there, if IT responsibilities are segregated, be sure to speak with your networking staff before proceeding as they may prohibit such traffic (don't ask me why).