Every Excel spreadsheet I receive includes column(s) somewhere of phone numbers. Rather than have to recreate in EACH file a new custom format I dream of being able to PERMANENTLY add two telephone number formats so that I can EASILY apply the following formats: ###-###-#### and ###-###-#### ###. Is there any way on EARTH that I can PERMANENTLY add these formats to MS's available formats?

Remember: I DO NOT CREATE new Excel spreadsheets, I only receive them, so templates would be useless.

frustrated...