Optimization of beams

Hi,

I'm new to Karamba and went through the manual and discussions. Still, I'm unable to optimise cross sections of beams in a structure. I've managed to minimise the '59 cross sections need to be bigger than their biggest family member'; and tried to customise beam structures, try different combinations, however to no avail. Please help!

Also, do I  need to assemble the beam first (with loads and support) and then send it to whole model assembly or only feed it as cross section to analyse and optimise as a whole?from%20scratch%202.5%20x.gh

I've attached the gh.

Thanks in advance :)