You can do this with a custom field or a custom theme. For three copies, print three copies. But all copies will be the same. You can circle which one it is.
Or, you can do this with rubber stamps after printing the copies.
Manager will not print three copies that are different from one another.
Thank you but if i want to add a custom field in the top right corner
Where the custom filed will be a drop down.list will select and print the copies
Could u pls help me how to i add the coding in theme to display the custom field in top right corner in sales invoice
This is not a coding forum. If you don’t have the skills personally to write your custom theme, hire a local programmer. Any competent web designer should be able to do such a job.