The presence of biofuels (blended biodiesel into fuel oil) does not change how you enter fuel oil consumption. For example: if your building consumes fuel oil no. 2 that contains 2% biodiesel, you would enter it all as fuel oil no. 2.
Blended biofuels do not need to be treated as separate deliveries because "biofuel" is not a uniform fuel type and lacks the level of consistency in composition and emission output of other fuel types.