Rename Linetypes
Work with Linetypes
Change Linetype Descriptions
To delete a linetype, use the Delete method. You can delete a linetype at any time during a drawing session; however, linetypes that cannot be deleted include BYLAYER, BYBLOCK, CONTINUOUS, the current linetype, and xref-dependent linetypes. Also, linetypes referenced by block definitions cannot be deleted, even if they are not used by any objects.
For more information about deleting linetypes, see “Set the Current Linetype” in the User's Guide.