When enabled, Autobuy Sweep automatically withdraws the bitcoin from each Autobuy deposit (above the 0.002 BTC minimum) to your registered BTC withdrawal address.
So when you make an Autobuy deposit the bitcoin is automatically processed to your registered BTC withdrawal address.
Autobuy Sweep doesn't affect any BTC already in your Coinfloor account or BTC acquired by trading on the exchange.
To enable Autobuy Sweep go to My Account---->Profile and Settings. Tick the box next to "Autobuy Sweep". Click "update"