PartEditor  Constraints Menu and Toolbar
In the PartEditor, use the commands in the:
•  to add sketchelements. The toolbar is to the left of the graphicarea. 
•  : to add Constraints to 
o  a sketchelement, and also 
o  its startPoint, its endPoint, and a centrePoint. 
MD14.2.120+
To DELETE a Constraint you must show the Constraint in the .
1.  SHIFT+CLICK a sketchelement, its startPoint, its endPoint, or its centrePoint, as required 
The sketchelement and Constraints show in the SelectionWindow.
2.  Rightclick the Constraint 
In the contextualmenu
PartEditor: Constraints menu
PartEditor: Constraints Toolbar
In the PartEditor, the is to the RIGHT of the graphicarea.
MERGEPOINTS : Deletes a Point. You cannot remove a 'Merged Point'.
•  Use MergePoints to join sketchelements endtoend, and to remove one of the Points. 
•  Use MergePoints to make a . 
COINCIDENT Points : Does not delete a Point. You can delete a CoincidentConstraint later and move the Points apart again.
•  Use a CoincidentConstraint to move together two Points, or a Point to a Line, or a Point to an Arc or Circle. 
•  Use CoincidentConstraints for construction geometry. 

You cannot overconstrain a sketchelement in the PartEditor (SolidWorks allows you to overconstrain, but you are given a warning).
For example:
A Point has 2 degreesoffreedom (DOF). It you add a 'coincident constraint' between a Point and a Line, you remove 1 DOF, and 1 DOF remains. The Point can slide along the Line.
You cannot then add a new constraint between the same Point and a Point at one end of the Line. A constraint between a Point and a Point would remove 2 DOF, but only 1 DOF that remains.

1.  SHIFT+CLICK a sketchelement in the graphicarea 
The sketchelement and constraints added to it, show in the SelectionWindow.
2.  Rightclick the constraint in the SelectionWindow 
3.  Click Delete in the contextualmenu 
