In InDesign there is a function to place a rule (line) above and/or below text. One can adjust the line up or down in relation to the text. The function is available as a character trait, so in the case of equations, I could create a rule (line) below the numerator (top number) and adjust it to be centered vertically between the numerator and denominator of the equation. Publisher has similar styles called line above and line below, but they are both paragraph level—not character level—styles.
Is there a way to modify them to work just on selected characters instead of on the whole paragraph? I've searched the fora and YouTube videos and haven't found any help.
Thanks in advance for your feedback!