virtualbox.org

I have a bandwidth monitoring program that only works on XP so I'm running it in a VM. It only shows the traffic inside the VM on the graph however. Is there a way to make it recognize traffic of the host?

No, unless you route your host traffic through the VM.

How do I do that?

Well that is a networking question, not really a VirtualBox question, and not a simple one. If you can't handle that, the answer to your original question is no. There is nothing within VirtualBox which can do that for you.