Creating Datums in NX sets up the ability to use Datum Reference Frames for tolerances, which details the position and references of the part.
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Procedure:
1.Navigate to the Part Navigator Tree.
2. Right click on the desired model view to make it the Work View.
3.Switch to the PMI (Part Manufacturing Information) tab.
4.Click 
Datum Feature Symbol.
5.Under the Associated Objects Tab, click Select Object.
6.Select a surface for Datum A.
7.Click [Select Terminating Object] under the Leader Tab.
8.Click the area on the surface where the leader for the Datum should originate.
9.Under the Orientation Tab, click Specify Plane. Click the plane that the Datum Feature Symbol should be viewed from.
10.Click to place the Datum Feature Symbol in the display.
