Floor/Ceiling Beams and Roof Beams are not automatically generated: they can only be drawn manually.
There are three types of beams you can create in Chief Architect: floor, ceiling and roof beams.
To create a beam
Open the plan in which you would like to add a floor or ceiling beam, and select Edit> Default Settings> Framing to display the Framing Defaults dialog.
On the Beams panel, click on the Edit Floor Beam Defaults button.
In the Floor Beam Defaults dialog, set the default values for your Beam Depth, Width, and Type.
Once you have finished making these changes, click OK to apply them, and repeat the process for the Roof Beam Defaults.
Click OK when you have finished adjusting the values for this dialog. Recall that these are just the initial values, you can always modify an individual beam to be different from the defaults once it is placed in your plan.
From the menu, select Build> Framing> Floor/Ceiling Beam or Roof Beam , depending on the type of beam you want to create.
Remember the floor framing is drawn on the floor below the floor in question. If you want to draw a floor beam for Floor 1, draw this object on Floor 0.
Click and drag to create the beam.
You can then use the Transform/Replicate or Multiple Copy edit tools in order to replicate the beam across the room or structure.