In PlansXpress versions 1 to 3, the floor plans were duplicated, and then the levels for the floor plans were attached to them.

In version 4, the Level tool is now used to create the additional floor plans as well.  This new process also automates the generation of all elevations.

This video here goes into more detail regarding the creation of the levels:     Creating levels and additional floor plans

Adrians video below shows the new process of creating the elevation having followed the above process for creating levels