Sound complicated? Alternatively you could follow the above advice and get to learn what is considered by most (myself included) to be a far better product.
Once you've got your midi file into sonar you'll just need to assign the midi track to AD2. Before dragging them into sonar you will probably need to load the Addictive Drums keymap, go to the keymap page, then from the file menu you can load the keymap, the one in BFD3 just says Addictive drums so if AD2 has a different key layout you may have to do it all by hand.
I don't think any of the grooves are in midi format so in order to use them you would have to install BFD3, load up some grooves in BFD3 that you like and then drag them either in to sonar or your desktop where they are converted to midi.You can either drag each groove out individually from the palette on the right side and then arrange them in sonar or you can drag them from the palette into the BFD3 track and then from there you can drag the whole song as one single midi file. In answer to your question, yes you can use the individual grooves but not the palette/songs as they are a proprietary format.
