Frequent tipster Leonid Nemirovsky demonstrates that you can use 2D tools even when working on 3D models in AutoCAD.
"When working in 3D, you still can use some 2D commands. For example, if you set your view to Top or one of the side views, your UCS (User Coordinate System) is set as if it were a 2D UCS, and you can use the 2D Rotate command. Sometimes it makes all the difference, especially if you use the Reference option during the Rotate command."
Notes from Cadalyst Tip Reviewer Brian Benton: While working in 3D in AutoCAD, you are still working in a 2D plane if you are using 2D commands. Using the preset views (Top, Bottom, Left, Right, Front, Back) helps to keep you in the correct "plane." If you have ever drawn projection views on the board (if you are old like me and Leonid), then think of that time — it's similar. If you create four viewports in model space and assign each one a different view (keeping the fourth view set to an isometric view), then you can easily use 2D commands to create your model.