Need some expert help once more…

Or customer has provided us with an .xlsx template to complete certain documentation.
We are currently manually copying and posting the required data, but obviously it’s not very efficient.
I am therefore looking for a VBA that completes this document.

Our tools issue a report that contains the required data (and then some more).
Column M contains our order number.
With each change in order number, I need VBA to
- copy the related cells that belong to 1 order number
- place them in A1 of the customers xlsm file
- save it with the order number from column M
- and then loop until the report is done.
(the report does have 1 header row that does not need to be taken into account)

Although I am able to update most information, I am stuck when I need to copy only certain cells.
Thanks.