You'll find several useful commands for controlling the views and layouts of the 3D viewport in the top ribbon menu under the 3D ribbon tab.
The import/export ribbon group contains several useful commands for importing and exporting 3-D.
Import/Export
Import
Click on the 
button to import 3D into your design. Read More...
Export
Multiple Viewports
You can have anywhere from 1 to 4 views into the same scene. Click on any of the five buttons in the viewport's menu to select the view configuration. The pattern in the buttons show you the layout of the individual views
