How to create the taper threads using Detailed Threads feature.
The visual display of taper threads is not currently supported in the Thread command, using the thread table inputs, you can specify taper internally, which will be used in drafting to physically display the taper of the threads in the drawing views.
In modeling while creating Detailed thread we just specify whether its tapered or not.
There is a field in the Thread table with the name "Tapered". 0 means not tapered, and 1 means tapered. (NX_Thread_Standard.xml)
But in modeling we don't represent thread as tapered, though it is marked as tapered.
Only Drafting represents it as Tapered. (In the drawing Views)