How to create viewports in Layout?
File Insert
But since you are asking…. Maybe go to learn.sketchup.com
FWIW, a viewport is a view of a SketchUp model that has been inserted into the LayOut file. It should be linked to a scene in the SketchUp model. Once you have the first viewport from a SketchUp model, copy it and paste it to make more of them on separate pages.
As Mike suggests, you should go through the tutorials at the link he provided.