How to vary my girder section?

Hello. I'm new to OBM and I'm tring to create an simple cross section variation from my support to the span, so I created two sections, my support section ( wider) and my span section. I modelled It following the guide " OBM: Varying the girder", but I cant by any means to model an linear variation. What am I missing here? Thanks a lot

The images below show my sections in OBM and also a image of the girder I want to model.

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