Invoices will be automatically combined at check out.
An email is sent for every item your customers comment "Sold" on, but they can click through the link on any of those emails to be taken to a single check out with all the items combined.
This customer commented "Sold" on Bunny Buckets and I Heart Tee and received two separate email invoices. The check out process combines both items into one order.
Any further questions? Reach out to Support at email@example.com.