Share Email Facebook Twitter LinkedIn To Create an Associative Center Mark Creates an associative center mark on a circle or an arc. Click Annotate tab > Centerlines panel > Center Mark. Find Select a circle or an arc. Continue selecting circles or arcs to place center marks. Press Enter to end the command. Related Concepts About Center Marks and CenterlinesAbout Editing Center Marks and Centerlines Related Reference Commands for Center Marks and Centerlines