A little notes field would be nice because sometimes I forget exactly what I had in mind when setting up a discount or surcharge. For example, if I run a promotion, I might want to remember the purpose or what I was thinking when I created it. Likewise, for surcharges, I often base a generic surcharge on various criteria in my mind. Ex. a $30 "Utility fee" might actually be estimates for gas ($20) +EV charging ($10). Or I might roll the property damage protection charge into a Management Fee that also includes something else. It would be nice to have a little space to document this.
