To create the next line or row on sale and purchase invoice automatically

Hi,
Is it possible to create the next line or row on sale and purchase invoice automatically. Like once I am starting typing line 1, it will create line two automatically and follow the same for next lines as well.

Now, for every additional line or row on sales and purchase invoice I have clicked to create a line or multiple lines.

The last empty line will not print on the invoice or will not save while saving the invoice. This saves time and speeds up the process.

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No, that is not possible. Empty lines are actually accounting records. Your concept of empty lines being ignored contradicts how the program works. You would be filling your data file with empty records.