Not sure if you can from the phone but in Google Mail you can do this easily.
Yeah its good but the syncing keep adding email addys even though all my phone contacts are under friends in gmail which is strange, so I just exported a vCard onto my SD and imported under the settings menu in people and it worked a treat!
I haven't added "Gmail" or "Facebook for HTC Sense" under "Accounts and sync" as it just keeps messing up as I can't select hyperlinks from emails via it so I just added my addy via Mail and its working fine now, and also with Facebook it just added the contacts which I couldn't get rid of without an erase, they kept showing up as I composed a message, and were still there even when I un-ticked auto sync/deleting account etc so I'm just not bothering with it for now.
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