So basically, go to gateway of tally and inside the accounting vouchers section - F8 Sales.For invoice no,write the serial number of the bill. In Party A/c name column, select the party ledger or the cash ledger. Select the relevant sales ledger. If it is local sale ,then select sales ledger for local taxable sales and if it is interstate sale,then select the sales ledger for interstate sales. Then select the required items, and specify the quantities and rates. In case of local sales, select the central and state tax ledger.If it is interstate sales,select the integrated tax ledger.Depending on your requirements, you can include additional details in your invoice by clicking F12: Configure such as buyer’s order no,delivery note no etc.