To set the default credit period for a ledger account
1. Go to Gateway of Tally > Accounting Vouchers > F8.
2. Set the option Use defaults for bill allocations? to No under F12: Configure. The Accounting Voucher Creation screen appears to record the sales transaction.
3. Accept the Accounting Voucher Creation screen and navigate to the Bill-wise Details screen.
To set the default credit period, no value is entered under Due Date, or Credit Days in the Bill-wise Details screen. Enter the appropriate value or date to specify the due date.