Every B has its own standardized VFR procedures, That's why they make TCA charts and print them both sides. Make yourself familiar with it before flight.
If you don't see a route you want to fly printed there, ask ATC if they can work you through, they often will. You can improve your chances by calling ahead to the tower, explaining what you want to do, and asking them what time would stand the best chance of being able to do that.
ATC in most Class Bs will let you do a lot of things if you just ask. When I was doing aerial photo all over SoCal they were always accommodating in the Bs even when I had to shoot during pushes due to light conditions. Once they feel you're competent and cooperative to break off and follow instructions with no delay, and are carefull not to violate boundaries they assign, they pretty much quit worrying about you and would even work me in to get shots within the floor of final.