Re: ide steel 8.103 composite beam and steel beam trimming Hello, In the program, composite beams are made by defining composite flooring on secondary beams. After defining the secondary beams, clicking the composite flooring icon and selecting the beams surrounding the flooring defines the composite flooring. You can also review your design results from the composite beam section in the steel design menu, and you can get the composite beam reports from the composite beam report button in the reports menu.