Is there a way of calculating the steel requirements using the Working Stress Method? If you set the load factors to 1.0 does the program assume Ultimate Strength formulas to calculate the steel quantity?
With the exception of a few design codes like AISC, all supported design codes are ultimate limit state (ULS). Individual load cases do not have a load factor so it is effectively equal to 1.0. However if you want to use the concrete design one would typically set up load combinations e.g. 1.4D + 1.6L (depending on the code) etc. and then only look at the load combination rebar outputs. The program always uses ULS formulas of the specified code, no matter what load factors the user entered in the analysis.