Can Tablature assignments be changed

I am using the dulcimer DAD instrument assignment in Dorico. The DAD dulcimer doesn’t have the extra added frets that I need in that the layout is diatonic. So, I changed the fret pattern on the instrument which was very cool. However, when I generate Tab, the numbers are off.

Is there a way I can reassign the fret numbers to the notes? An example would be that the dulcimer fretboard has a fret at the 6 1/2 position, which adds a C#. Usually this non diatonic fret is marked as 6+ with the 7th fret being the octave of the string. I am a Finale user

I altered the fretting so the C-natural (on the D strings) produces a 6fret in TAB, but I have to enter 6+ and 1+ manually on a PDF of the TAB.

I have mentioned this to @dspreadbury, but when one thinks about the way the TAB system is configured for other fretted instruments, it is unlikely it can be adapted to the dulcimer’s diatonic+ tuning.