You can search all the data in your Tally account using the global search facility. When logged into Tally, click the magnifying glass at the top right of the black bar along the top of the screen, enter in your search term and hit enter.  This will search all your Tally details including customers, invoices, suppliers, receipts and any external references such as purchase order numbers or customer reference numbers. You can also type in an amount here, invoices or receipts of matching value will show in the results.  *Please be aware there is an exception in that any notes entered on invoices cannot be searched for.