Google Scripts - Custom Form to Spreadsheet "Database" to Filled Invoice

My first attempt at using Google Scripts to automate tasks. Link to my script on GitHub https://github.com/kcl1s/google-script/blob/main/GS%20form%20to%20invoice.gs I got inspiration from these videos. https://www.youtube.com/watch?v=CA4FwDQBz9w&list=WL&index=1&t=230s&pp=gAQBiAQB https://www.youtube.com/watch?v=HkQdZzISn5s&list=WL&index=2&t=102s&pp=gAQBiAQB https://www.youtube.com/watch?v=iLALWX0_OYs&list=WL&index=3&t=227s&pp=gAQBiAQB