How do I add a custom number format in Excel 2003 ? I go to Format, Cells, Custom, and from the category list, I try to type in a new list, but nothing happens. I dont see an option to save a new list either. There is a button to delete existing lists, but not to create or save one.
I am trying to make a custom list that has "Bad";"Fair";"Good";"Great
When I try to edit the existing: "Yes";"Yes";"No", or to just begin entering a new set, I get the error below:
What am I doing wrong?