Sort a list of names address phone numbers and Service months by service month

[Water777]

I need to sort our 700 clients by Service Month. The excel file has their names, addresses, phone numbers, emails, and service months in separate columns. Some of them do not have service months. The sort is presently by name

[#2]

On the Home tab of the ribbon, Editing group (on the far right), click the Sort & Filter drop-down and select Custom sort.