Problem A Tutorial: Define Beam

 
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Select Beams in the Geometry menu.
This is the Beam input window.

Select "..." in the Section option.

This is the New Section input window.
Select the I-beam icon.
Select W in the Family pull-down menu.
Select the appropriate beam section.
Select Add.  This will make the selected section available in the Beam input window.
Select Close.
Make sure the desired section now appears in the Section option.
Define the left-side (x,z) coordinates for the beam.  Use (0,0) for simplicity.
Define the right-side (x,z) coordinates for the beam.
Select Add.
Select Close.
The beam is now represented as a line.