Press the command “Levels and Grids”. 

The application uses the metric system, all units must be entered in millimeters. 

Enter the distances between the grids in the X and Y axis. 

Enter the Number of levels desired, this value has to be an integer. 

Enter the desired distance between levels Check the boxes if you want to create plan and ceiling views of the created levels.

Then, Press “Grids”, “Levels” or “Grids/ Levels”. If there is something wrong, you will hear a negative beep and the information bar will let you know about the problem.

The installer that ran when you downloaded this plug-in from Autodesk App Store has already installed the plug-in. You may need to restart Autodesk® Product to activate the plug-in. To uninstall this plug-in, click Control Panel > Programs > Programs and Features (Windows 7/8/8.1/10) or Control Panel > Add or Remove Programs (Windows XP), and uninstall as you would any other application from your system.

Do not use in already developed projects, since will delete levels and elements on them.