I have searched the help in ver 4.2 beta 1 for this topic and did not find anything specific. I have watched Mark's video (which is very Helpful), but still is lacking details on how combinations of the different fields works.
After doing trial and error (mostly errors), i come up with the table below

I used the DBL Greek in advanced prioritizing, and use the right click fields Lemma and Greek Strong's Numbers
When setting DBL Greek to the following:

I would expect DBL Greek to be used First when in the ESV and looking under Greek Strong's Number. It did.
But when setting DBL Greek to the following:

I would expect DBL Greek to be First when looking under Greek Strong's Number and in the book of Luke. But it also is First when in the book of Mark.
As you can see some combination do not seem to work (you can try the combinations in the table above).
Does anyone know of specific documentation on this feature?