Short answer: As long a sthe tool fits down the hole, yes.
Multiple ways to do it, I'd try planar mill.
Use avoidance geometry (start/return points) and engage/retract as needed.
Production: NX10.0.3.5 MP5 + patch/TC11.2
I'd rather be e-steemed than e-diseaseled
There is no dedicated operation for this yet. Radial groove milling comes the closeset but it currently requires a bottom.
If it's just a single cut level use planar profile with a tracking point on top of the t-cutter.
I'm not familiar with the Generic Motion operation. How do you access this operation?
Generic Motion is found in the mill_multi-axis and probing template types.