You want the beam to cut the post.
You won't get a dashed line as you have drawn manually.
If your column has a stronger Building Material than the beam, the column will cut the beam (as in your image.
But if the beam has a stronger building Material than the column, then the beam will cut the column.
Note the faces of the beam and column must align to see this in elevation.
You can not see the hidden line if the faces are not aligned - you will have to draw that yourself with a line.
Make sure you do not have surface overrides on.
If you do, it should still look like this unless the beam and column surfaces are the same.
In that case you will see no lines at all.
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