Hi Priti,
Collate complete data in one Excel file and prepare a pivot table by employees, their expenses, and Aging analysis. It will give you employee-wise details grouped in ages (<30 Days, 30-60, 60-90, >90 Days). Please let me know if you have further doubts, or else provide me the sample expense sheet, and I will send you a prepared report.
Warm Regards,
Vinodkumar Gandhe.