Automatic Centerlines command bar

Dimension Style Mapping: Specifies that the setting on the Dimension Style tab of the Options dialog box determines the dimension style. When you set this option, Dimension Style is unavailable.
Dimension Style: Lists and applies the available dimension styles. This control is unavailable when Dimension Style Mapping is enabled.
Center Line and Center Mark Options: Displays the Center Line and Center Mark Options dialog box.
Center Lines: Specifies whether centerlines are added to or removed from the drawing view.
Center Marks: Specifies whether center marks are added to or removed from the drawing view.
Center Mark Projection Lines: Specifies whether center mark projection lines are added to center marks.
Connect Center Marks: Specifies whether center marks are connected with lines when they lie on the same x-axis or y-axis.
Add Lines and Marks: Specifies that you want to add centerlines and marks to the drawing view (according to the command bar settings you specify).
Remove Lines and Marks: Specifies that you want to remove automatically-created centerlines and marks from the drawing view (according to the command bar settings you specify).