To Unload an Unused Linetype
Click
Format menu
>
Linetype
.
In the Linetype Manager dialog box, choose the unused linetype, and click -.
Note:
Several linetypes cannot be unloaded: BYLAYER, BYBLOCK, CONTINUOUS, and any linetypes currently in use.
Use the PURGE command to remove all unused linetypes from a drawing.
Related Concepts
About Linetypes