https://help.tallysolutions.com/docs/te9rel60/Advanced_Features/Advanced_Accounting_Features/Altering_a_Currency.htm

Altering a Currency

You can modify or delete a currency master in the alteration mode of the currency master.. The rate of exchange can also be altered from here.

To alter a currency

1.    Go to Gateway of Tally > Accounts Info. > Currencies > Alter.

2.    Select a Currency from the List of Currencies list

3.    In the Currency Alteration screen, modify details as required. For more information refer Creating a Currency.

Note:In a remote connection, if the Formal Name defined in a ledger while passing a transaction is not the same as defined in the company selected, an error message is displayed.

For example, Must use currency “$” for ledger "Sales".

Deleting a Currency

To delete a Currency

1.    Go to Gateway of Tally > Accounts Info. > Currencies > Alter.

2.    Select a currency from the Currencies list (displayed, if there is more than 1 currency). 

3.    Press Alt+D in the Currency Alteration screen to delete.

Note: You cannot delete a currency if it is used in a transaction.