OK - bear with me here.
That is a beam from neverland. Steel performs in a manner that guides all stock beams to have less steel in the webs and more steel in the flanges. My first suggestion is that if this is a design project use a standard profile for that beam, the small curves in your beam are creating multiple lines in elevation. Using a stock Orthogonally built beam will eliminate those extra lines.
What is very cool in AC is that you have the option of loading country specific steel beam catalogs directly into AC.
The normal solution to your design problem is to use two back to back "C" channels (or flat stock) welded with flat plates to get that cross section.