You could do this quite easily using a pair of DATABASE fields in a normal ‘letter’ mailmerge main document and a macro to drive the process. An outline of this approach can be found at:
https://answers.microsoft.com/en-us/...1-1996c14dca5d
If you modify tour Excel workbook by adding a separate worksheet with a table with just a single instance of each of the grouping criteria (i.e. employess), a pair of DATABASE field in a normal ‘letter’ mailmerge main document could be used without the need for a macro. An outline of this approach (using a single DATABASE field) 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).

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]