It is possible to have a beam rotated to a specific angle without the use of a stored custom profile! If the beam is a simple square shape, but at a 30º angle, you do not need to create a rotated complex profile. Just select the Structure: Complex Profile button and leave the profile selection as Custom. You can then set the rotation angle.
For a Custom Complex Profile beam the options are to stretch, rotate or move. Rotation can also be set using the pet palette in section view for precise matching to other sloped elements.
There are a few editing issues with this method; not all editing is obvious. Resizing can not be done in the model/section/plan views via the pet palette. To resize the beam open the selection settings and manually type the new size. Since custom profile building material and surface settings are stored in the profile manager you will not have the option to change these settings for a rotated beam. To apply a new surface or building material, switch the beam back to a square profile, make the building material/surface changes, and change back to a custom profile (the rotation, size and position will be retained from the previous setting).