Fundamentals > Creo Parametric User Interface > The Tools Tab > Getting Information > Investigating References > About Deleting References
  
About Deleting References
You can delete references in one of the following ways:
Using the Reference Viewer dialog box—You can delete a reference through the Reference Viewer dialog box only when Creo Parametric identifies it as an additional reference that can be safely removed. You can access the Reference Viewer dialog box using the menu bar, menu manager, or the Model Tree.
Using the Edit Definition command—You can delete all references, including the references that cannot be deleted through the Reference Viewer, by clicking Edit Definition on the shortcut menu that appears when you right-click a feature on the Model Tree.
To delete a reference through the Reference Viewer using the menu bar, click Tools > Reference Viewer, right-click the reference in the Reference Viewer dialog box that opens, and click Delete Reference on the shortcut menu.
If a feature fails for a missing reference, click Investigate > Show Ref on the RESOLVE FEAT menu that appears, right-click the reference in the Reference Viewer dialog box that opens, and click Delete Reference on the shortcut menu.
To delete references through the Reference Viewer from the Model Tree, right-click the feature on the Model Tree and click Tools > Reference Viewer.  Right-click the reference in the Reference Viewer dialog box that opens, and click Delete Reference on the shortcut menu.
You can delete missing references only for features that have the following types of references:
Feature Type
Reference Type
Round
Edge, Variable round point
Chamfer
Edge
Copy Geometry, Publish Geometry
Edge, Surface, Datum Plane, Datum Axis, Datum Point, Coordinate System, Feature
Annotation Features
Annotation plane references, User references, Leader attachment references, Surface finish reference surfaces
Thru-Point Datum Curve
Reference point of a Thru-point datum curve
Delete Reference is not available if:
Deletion of a reference changes the structure of the feature. For example, deleting an edge in a round changes the type of round.
You are deleting references for Thru-Point Datum Curve with Tweak option.
A reference belongs to a logical collection such as a tangent chain, intent chain, surface loop, surface boundary and so on and the anchor is not a part of selected references.
A reference belongs to a pattern feature, pattern instance, or leader. To delete references from a leader, suppress the pattern and delete references.
Reference belongs to restricted annotation elements or dependent annotation elements. However, you can delete annotation plane references from dependent annotation elements if these annotation elements belong to annotation element propagation feature or data sharing feature.