CopyCAD has an Explorer window to the left of the CopyCAD graphics window. This displays the workplanes and models you create during your CopyCAD session. Each time you carry out an operation that changes the selected model, CopyCAD creates a new model and displays it in the list.
When you open CopyCAD there are three entries already present in the CopyCAD Explorer - Curves, Workplanes and Models.

CopyCAD displays a pop-up menu when you right click on an entry in the Explorer.
Displaying more than one model
Manipulating Models in the Explorer
Transforming Models using the Explorer