Tools > Level Settings
Displays the Level Settings dialog box, which allows you to select the categories (or levels) that you want to display for one or more design files. You can turn on a level by selecting a category; or, if you already know the level of a category, you can turn it on by selecting the level number. You also can read the current level settings in the Plan, Elevation, or Main view windows and change the level settings for designated views. The level names for selected objects display in the Text window.
The design area is composed of 63 identically sized, overlay planes. These overlays, or levels, can be thought of as stacked panes of glass with a group or category of drawings on each pane. For example, SPRdemo.dri is designed with the handrails on one level, the platforms on another, ladders on another, and so on. You can view each level of the stacked drawings by turning on the individual level, or you can view a complete model by turning on all the levels. You can also view any combination of these levels.
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