I appreciate you reaching out to the Community forum, usermfrank301.
I want to make sure I've got the right information to provide you with a resolution. May I know what specific tasks you're trying to achieve when handling customer invoices? What features or customizations do you want to have on these forms? You can also share screenshots for us to have a visual reference on your end.
I'll keep an eye on this thread for any added information when managing your sales forms. Just let me know in the comments below, and I'll be sure to assist you further. Keep safe!