How do I withdraw money from BitPay? I have funds in BitPay that I received from several sales on my website. My split is 0% USD cash and 100% Bitcoin. 

Is it possible to transfer this Bitcoin balance to another account within BitPay?

Alternatively, how can I withdraw bitcoins from my account? I cannot find a withdraw option in my dashboard section.
According to their support site it should be on it's way without you doing a thing. I quote:


  If you choose to take settlement in bitcoin, BitPay will forward bitcoin payments to your bitcoin address on file. The minimum settlement is 0.01 BTC.


Maybe look on blockchain if there is an unconfirmed transaction to your address or reset Multibit if you are using that. Or you haven't hit the minimum settlement of 0.01 BTC.