When you use the Save Current Map to AutoCAD wizard, you can specify an AutoCAD (.DWT) template to map layers, blocks, and linetypes to same-named items in the template. The template will determine the appearance of those items in the resulting AutoCAD file.
To create a conversion template
To use custom hatches in a converted AutoCAD drawing
The standard AutoCAD hatch files are acad.pat (for use with imperial drawing units) and acadiso.pat (for use with metric units). By default, these files are stored in c:\Documents and Settings\your name\Application Data\Autodesk\AutoCAD version\enu\support.
For information on adding hatch pattern entries, see the AutoCAD Help. Name each hatch pattern to exactly match the fill selection it will replace during conversion. For example, if a polygon feature uses a fill called “Slant,” you must name the corresponding hatch pattern “Slant.”
Make sure that there are no carriage returns in the file, except at the end (to indicate the end of the file). If there is no carriage return at the end of the file, AutoCAD cannot read it and will display an error message. If there are interim carriage returns, AutoCAD will stop reading the file after the first one.
The conversion process will now find the hatch patterns and apply them to entities that use same-named fills when converting. You can also apply these hatch patterns in AutoCAD, using the BHATCH command. They appear on the Other Predefined tab.