You can fill closed polylines in your drawing with solid fills and hatch patterns. For example, you can use one color to show counties with a population over 10,000 and another color to show counties under 10,000.
Filling closed polylines
The ADEFILLPOLYG command always creates a hatch object with the solid fill hatch style.
You can also use the BHATCH command to fill closed polylines. Use the MPFILL command to fill polygon objects.
To fill closed polylines automatically with hatch patterns or solid fills when performing queries, use the Alter Properties feature in the Define Query dialog box.
If you set the Create Associative Hatch Objects option on the Query tab of the AutoCAD Map Options dialog box, AutoCAD Map 3D toolset creates associative hatch objects for hatch objects created by the ADEFILLPOLYG command, the ADEQUERY command (using Alter Properties), and the MAPTHEMATIC command (using a fill).