Welcome to QuickBooks, bigfiredawg21.
Currently, you can only import a custom invoice template using a .DOCX file. Let me share with you some information about this.
Custom form styles are available in QuickBooks Online. You can import and add your company information to highlight your brand. Please check this article for more information and detailed steps: Import Custom Form Styles For Invoices Or Estimates.
For more information, you can also import multiple invoices at once.
You'll want to record invoice payments in QuickBooks Online: Record Invoice Payments In QuickBooks Online.
Let me know if you need help. I'll be around to help.
