Is it possible to create beams with custom profiles?

Yes, it is. These are the steps to create a beam from a custom profile:

  1. Create a custom profile with the _vaProfileFromCurve command VA_ProfileFromPolyline.jpg, that will be used for the beam section profile. The selected curve must be planar and closed. Checkout this tip to learn how to create a custom profile.
  2. Create a new beam style: open the beam styles dialog (_vaBeamStyles command) and click on the New button to create a new beam style.
  3. Select the new beam style and assign the custom profile you have created from the Geometry tab.

The VisualARQ beam styles dialog with a beam style with custom profile selected.
The custom profile alignment points are the 9 main points on its bounding rectange.

The alignment of that beam will be taken from the 9 alignment points of the rectangle enclosing the custom profile curve.