Thank you Sherry! I tried it and it works! Not that I didn't believe you.... but after trying many methods until I asked I had found only one way that worked on ocassion.
This was to add a grace note directly under the existing one at a 05 note velocity and then deleting the other grace note. Thanks you for your time and quick response because I DO appreciate it!
For the future version of Notation (if it ever comes out) could it be on the to-do list for grace notes to be edited like all other notes via "note velocity".... where you can quickly type in a specific note velocity value with precise and quick accuracy?? Thanks again for reading and for your time. I DO appreciate it!