Welcome to the Community! QuickBooks Online makes it simple to manage your invoice templates. I'll be happy to share more info about invoice templates so you can continue to manage your business with peace of mind.
I recommend exporting your invoice template from Corel Wordperfect then import the template into QuickBooks Online. I also suggest reaching to Corel Wordperfect for assistance with exporting from their platform. Here’s how to import an invoice template into QuickBooks Online:
Click on the Gearicon.
Select CustomFormStyles.
Click on Newstyle and then choose Importstyle.
You can click Download a sample invoice, to get the acceptable file by QuickBooks.
After editing the sample file, you can browse the document and click Next.
Then QuickBooks will show you the status, if it’s accepted then click Next.
After the confirmation, then click Save and you can put the Templatename.