Hi Kitty,
When you open the Overdue Receivables report, in the Sort By section there are a number of different fields from which you can choose which customers to pick and how they are sorted. Assuming you just want to select customers over 60 days (and not affect the existing sorting), in the last drop-down field of this section, look for the Number of Days field value. From here you can enter a range of days overdue - in your example you can enter 61 to 9999.
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Regards,
Softrak Tech Support