the place which you are looking for, is called NX DOC
Doc Center --> --> Manufacturing (CAM) --> User Defined operations and CLSF --> CLSF Manager
The CIRCLE statement specifies a tool path arc in any arbitrary plane, or a helical motion. This statement is automatically generated when boundaries containing circles are machined using the Lathe or Mill functions. Circle records are output in the following format:
x,y,z is the center of the curve or helix in MCS.
i,j,k is the circle or helix axis vector in the MCS (assuming a clockwise direction).
r is radius of the circle or helix.
t is the total tolerance, equal to INTOL + OUTTOL. (Uses custom tolerances if any are specified)
f is ratio = INTOL / (INTOL + OUTTOL). (Uses default tolerances for the part) For example, if f is .25, this means that 1/4 of the total tolerance is INTOL.
d is the tool diameter.
e is the corner radius of the tool.