#### Modifying Levels

Level modification consists of a 5-step process:

1. From the Level dialog box, select an existing level from the drop-down list.

2. Click on the Modify button.

3. Select the Assign button to add CAD to the chosen level, or select the Undo button to remove CAD from the chosen level.

4. From the Feature Type check boxes, select the appropriate feature types to be 'added to' or 'removed from' the displayed level.

5. Select the Finish button to complete the level modification process.

Level addition and level modification will require the selection of CAD data. You can restrict the selection to different types of geometry in the same way as selection is restricted in the Edit CAD and Delete CAD dialog boxes. Also, selection may be restricted to CAD of a given color by checking the 'Color' check box and selecting a geometry of the desired color. The selected color will then appear next to the 'Color' check box. To change a color, clear the 'Color' check box, then re-select the Color check box, selecting the geometry with the new color.

You can close the Level dialog box by clicking OK or Cancel. The Cancel button will not save the results of any operations in progress.