When you receive a bonus, and your bonus is activated, it will only pull from your real cash balance in the following scenarios:
Sportsbook - The odds of the bet you are placing are lesser than -200. As long as the bet is -200 or greater (meaning -190, -110, +250, etc), it will pull from your active bonus cash.
Casino - If you are playing roulette or baccarat, it will draw from your real cash balance. You have the ability to use active bonus money on slots and all other table games.