Pole top extension
It is easy to model a pole top extension. All you need to do is attach the conductors at the height above ground as they will be on the extension. The profiler draws a line extending from the top of the pole to the conductor attachment height and correctly calculates the tipload (which is always relative to the pole tip).
If you have created a construction model for the extension it will already have the additional height reflected in the Y coordinates of the attachment points. Just attach the construction at the suitable kongbolt spacing below pole tip.
Here’s a photo of a pole top extension from a manufacturer’s website.