section and plastic modulus of built up members

mdub12

is there a simple way to determine the section modulus of a member made of a W and WT shape welded together, one on top of another about the x-axis. the steel manual has the properties for the individual sections; would the section modulus of each be able to be added together or will i have to calculate it by hand because it's not symmetric about the x-x axis

mdub12

never mind, pretty sure it has to be all calculated by hand