Try stepping some of the passive device parameters and seeing what you have to change to push the Bode plot along the path you want then try to understand why that worked or did not. Its hard to say without making you virtually write a paper outlining all the steps. The simulation may include parasitic impedances of other components or tolerance worse case or may have actual values for active components whereas your calculation was idealized. Assuming you are asking why does my simulation get different results than my calculation? I might guess that the math underlying the simulation was not exactly the same as the formulas you chose to make you paper calculation. I think you would get better answers from the NI MultiSim forum anyway. Your image did not come through so I think part of the question is missing.
