ah! that will teach me to read too fast: the inclined beam.
just looking at the script, it looks as though it calls a steel macro called 'I Beam Slope' for as many times as you have different sized regions in your beam - passing the size parameters to it as it goes.
try opening that macro and see if you can reverse engineer it for different profile shapes using the standard profile shapes as a reference . . .
then you will have to find some way of assembling it into a beam you need. i will have a look over the weekend, but i'm pretty flat out at the moment . . .
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