Custom rule for reporting on "all" checkbox field
I have an "industry" field setup as checkboxes. As such, there is an "all" option, so "all" means you are selecting all 10+ industries. On our reports, we do not want all 10+ industries displayed, as that is confusing people. Instead, I would like to use text mode to write a formula so that - when industry field checkbox "all" is selected, the term "cross-industry" displays on the report under the industry field. Does anyone know the formula for this?
Note: we are keeping this field as checkboxes, so changing it to dropdown is not a choice.