Demand Load Library - Add Rows

How to Add more rows into the Demand Load library?

Steps:
Open up the Demand load library by going to Document/Library/Demand Load Library and open ANSI.DLD Or IEC.DLD depending on your application.

Now, Click Edit and select "Multiple New Rows..." option to add more than one additional rows.

Here you can also use Copy and Paste command.

Please review below screenshot.
I hope that helps.