Centerline Annotations
Centerlines are annotations that mark circle centers and describe the geometry size on drawings.
You can insert centerlines into drawing views automatically or manually. The SolidWorks software avoids duplicate centerlines.
If you dimension to a centerline, the extension lines are shortened automatically.
To insert centerlines automatically into drawing views:
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In a drawing document, click Options 
, Document Properties, Detailing.
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Under Auto insert on view creation, select Centerlines.
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Click OK.
-
Insert a drawing view.
Centerlines appear automatically in all appropriate features.
Centerlines are not inserted automatically, even when the option is selected, if the model is in Large Assembly Mode
, or if the number of components exceeds the threshold for large assemblies.
To insert centerlines manually:
-
In a drawing document, click Centerline 
(Annotation toolbar), or click Insert, Annotations, Centerline.
The Centerline PropertyManager appears.
NOTE: You can select either the tool or an entity first.
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Select one of the following:
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Two edges (parallel or non-parallel)
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Two sketch segments in a drawing view (except splines)
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A face (cylindrical, conical, toroidal, or swept)
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A view in the graphics area
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A feature, component, or drawing view in the FeatureManager design tree
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Click OK 
.