Glad to have you back here in the Community, @searay2000.
I can share some information about using a different email address to imported invoices in QuickBooks Online.
Statements and invoices utilize the email address that is set up in your customers' profile. Having that said, using the different email addresses to imported invoices isn't available. Instead, you'll need to manually change them.
On the other hand, I'd like to let you know that QBO allows you enter multiple emails in your customer's profile or invoices. Any attached email will receive the invoice once sent. Make sure that the email addresses are separated with commas (,).
To give you more details about managing customer's and emailing forms in QuickBooks Online, please see these resources:
Know that my doors are always open to help if there's anything else you need. Thanks for coming, and have a good one!
