What's New: Creo Parametric 4.0 > Model-Based Definition > Improvements to Dimension Arc Attachments in Model-Based Definition
  
Improvements to Dimension Arc Attachments in Model-Based Definition
Dimensions created between arcs, circles, or cylinders can be adjusted.
User Interface Location: Click Annotate > Dimension.
Release: Creo Parametric 4.0
Benefits and Description
You can watch a video that demonstrates this capability.
Dimensions created between arcs, circles, or cylinders can be adjusted to reference the near tangent, far tangent, or center of each arc attachment. These options are available on the Dimension tab for any dimension that refers to at least one arc, circle, or cylinder.