https://help.tallysolutions.com/docs/te9rel60/Tax_India/VAT/West_Bengal/WB_MRP_sale.htm

Recording Sales at MRP (West Bengal)

You can create sales voucher with tax on MRP. Enable the  option Allow MRP/Marginal for stock items? in F12:Configure while creating the stock item.

To record sales transaction with tax on MRP

1.    Go to Gateway of Tally > Accounting Vouchers > F8: Sales.

2.    Select the customer name in the Party’s A/c Name field.

3.    Select the required sales account.

4.    Select the stock item for which Calculate VAT on MRP is enabled.

5.    Select the Godown name, and enter Quantity and Rate for the item.

6.    Press Enter to save.

7.    Select the common VAT ledger. The rate will be calculated automatically based on MRP of the item.

The sales invoice appears as shown below:

8.    Press Enter to save.