I would save time if when attaching patients to documents that we could select multiple patients at one time instead of having to do them one at a time. (Hold down Ctrl button to select all that apply)
If you are referencing an EOB for example, you could use these steps.
Scan and attach the EOB in the Document Center for one of the patients
Click on the Document then, Edit | Modify Document Attachments
Under Attach Documents By, click the >.. button by Patient
Choose one of the other patients on the EOB
Repeat as needed for all patients on the EOB