There is no element type “HAUNCH” in STAAD.Pro. A relatively simpler way would be to break the beam and the column into segments where the haunch member is connected and then assign a higher equivalent cross sectional property to those two segments. Alternately you can also model a beam member for the haunch and assign it the IPE500 cross section. Although this would not be a cut section but as far as analysis is concerned, I don't think this would be too bad.
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