What I have is an angle that needs to be <10° and it's driven by another dimension. What I want is for the driving dimension to grow by 100mm until the angle drops under 10°. I tried a nested IF statement, but that didn't work.

This is what I tried to use, unsuccessfully: =if("Bridge Angle@Driving Sketch">10, 450, If("Bridge Angle@Driving Sketch">10,550,If("Bridge Angle@Driving Sketch">10, 650,304.8)))

It changed the driving dimension to 450 and stayed there even though the angle remained <10°.

Any thoughts?

do you mean the angle stayed at >10°? Anyway, I think you are misinterpreting the if function. You have it written like

if (condition, result, then)but in reality it isif (condition, result, else). So when it is executing your equation in the first if statement it says the angle is greater than 10, so set the dimension to 450, and it ignores the rest (the else part).I am trying to think of an alternate equation.