What works really depends on your database structure. A DATABASE field in a Word document may be the way to go. An outline of this approach can be found at:
https://answers.microsoft.com/en-us/...f-8642e46fa103
For some working examples, see:
https://www.msofficeforums.com/mail-...-multiple.html
https://www.msofficeforums.com/mail-...tml#post151706
Merge excel list into Word Receipt
(the second of these uses a macro to apply some additional formatting).