Ans:
Tally ERP 9 does not allow you to change the existing cheque formats. You can, however, use the current formats to create a new cheque with the needed dimensions.
Send a cancelled cheque to Tally Solutions if you wish a different format to be included. After receiving the cancelled cheque, the check format will be properly adjusted in Tally.ERP 9. You can also manually configure the required cheque printing configuration.