Chord Own Symbols

Hi Guys!
There is a way toedit my own chord symbols and always i input them go to my way in dorico?
For example:
I like to use Gmaj79
And i only get have or G9maj7 or Gmaj9, but i usualyuse Gmaj79.
And in some chords the bemol its so close to the letter of the chord.
The bemol its almost merged with the A .I edited its in engrave mode, but i need to do that in each chord of the part.Chord by chord.
There is a way to edit it and always i type that chord my modification go on?

Engraving Options > Chord Symbols.
If there aren’t options there for the things you want, then scroll all the way down to the bottom and hit the Project Default Chord Symbol Appearances button.