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I can think of two possible reasons.
1. The person who created the model wasn't smart with the dimension placement/parents.
2. Company standards dictate using Created (added) dimensions.
In Reply to Michael Locascio:
Why would you want to waste time adding dimensions
when you can get them from the sketcher?
this is not a setting in Creo 2.0, it has the the red circleand the line thru?