We are using STAAD Pro for optimizing our designs. We deal in steel structures & we need to optimize it by curtailment in all the three axes, presently we can do curtailment in the web depth ( Taper I section). We want to reduce the width of the flanges similar to the depth of the web. Please include this small request & fulfill the need.
We also work on plate box girders, there also we require the optimization by curtailment.
I dont think you mean all three axes, as clearly you are not looking to change the length of a member. What I think you want is for STAAD to optimise the shape of a welded wide flange by modifying a number of section parameters namely the a) web height, b) the flange widths (do you expect top and bottom flanges to be the same size) c) the flange thickness (again assume both top and bottom flange to be the same thickness). There are might operate, but are you also thinking about the steps in each would be? e.g. change thicknesses would be in 1mm increments but the heights and widths might be 10 or 25mm? Perhaps you might think about this and add your thoughts so it is clear what you are looking for.