https://help.tallysolutions.com/docs/te9rel60/Tax_India/VAT/Delhi/Decrease_Of_CST.htm

Recording Decrease in CST (Delhi)

You can make a journal entry for recording decrease in CST by debiting your CST ledger and crediting the applicable expense ledger.

To account for decrease of CST

1.    Go to Gateway of Tally > Accounting Vouchers > F7: Journal.

Note: You can create a journal voucher from Gateway of Tally > Display > Statutory Reports > VAT > select the VAT or CST form.

2.    Click J: Stat Adjustment. In the Stat Adjustment Details screen,

o     Select Type of duty/tax as VAT.

o     Select Refund of Input Tax, as the Nature of adjustment.

Note: Based on the selection made for Nature of Adjustments, the Additional Details option either appears or disappears.

o     Press Ctrl+A to return to the voucher.

3.    Debit the CST ledger grouped and enter the amount.

4.    Credit the expense ledger. The journal voucher appears as shown below:

5.    Press Enter to save.