Click Maintain Relationships 
on the Relationships toolbar.
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If the Relationships toolbar is not displayed, click Relationships
on the Main toolbar.
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You can also click Tools > Maintain Relationships.
When Maintain Relationships is set and you apply relationships to new or existing elements, the software places relationship handles on the elements. Elements that share relationships are associative; when you move an element, the other elements on the drawing sheet move according to the relationships they have with the element that you moved.