In Finale 2012 and several earlier versions, chord suffixes can be created by simply typing them in with the Chord tool. If every chord suffix library for Finale was the same, you could simply type in a standard keystroke for each suffix.
However, depending on the library that is currently in use for the suffix, this isn’t always the case. For instance, consider the different ways arrangers indicate a major 7th chord: M7, MA7, MAJ7, etc. In Finale, the in order to type in a chord suffix directly, it has to exactly match one of the existing suffixes in the current library.
In addition, some symbols, like the Triangle ∆ (Delta symbol) sometimes used for MA or MA7 chords isn’t an obvious keystroke. Furthermore, some chord fonts, such as the JazzCord font, are designed to display each suffix and any of its alterations using a single font character (e.g. “∆7” isn’t two keystrokes in JazzCord, it is a single character).
To locate, display or edit these suffixes which can’t simply be typed in, and for which you don’t know the shortcut: enter the chord name without the suffix, (e.g. “C”) then right-click to select “Edit Chord Definition”. This will allow you to manually choose the chord suffix.

more >> “Locating and Editing the Triangle Symbol for MA7 chords in Finale”