In the past we would just create a layer (we could name it GEOTOL for example) and add datums and notes associated with geometric tolerances.
We could then (in the previous releases of ProE) hide or show this layer conveniently and add items as needed.
This was always the best way to manage the display of datums or notes assigned to geometric tolerances.
For some reason this functionality has been removed from creo. We are now asked to create a combined representation.
This functionality should be returned in the next build.
Check out the comments in this idea for some updates on this issue:
Change Datum Tag Symbology to reduce confusion
The problem is that PTC has removed the ability to control 3D annotations with layers.
This is compounded by the fact that the Datum properties dialog box shows different eras of GD&T datum styles on the buttons when what they really intend is to show: Not Set (A), 2D (-A-) and 3D (>-A) annotations (see the link above). This causes everyone to make set datums as 3D annotations and therefore they cannot be controlled by layers.
2D set datum planes can still be controlled by layers, but 3D set datum plane annotations are always visible in the Default combined state which is the default view of models (the All tab of the view manager). 3D set datum plane annotations can only be hidden by finding them in the Annotation tree of the model and selecting Erase from the right mouse button menu. This does not actually delete them, it just hides them. PTC says they are fixing the symbology in Creo 4.0, but the behavior of 2D vs. 3D set datums will likely stay the same.
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