From the Users Page, you can generate a consolidated receipt displaying all of an individual guest's purchases/orders and/or a combination receipt for more than one user's purchases. Combination receipts are useful if a guest has orders under different variations of their name, or a couple with separate orders wants a single receipt.
To generate consolidated or combined receipts:
Go to Admin > Manage Users:
The Print option provides a preview screen, the Email option does not. To preview the receipt before Emailing, select Print (opens in a new tab) then cancel and return to the original tab to Send via email.