Hi there.
If the main data is in Excel, I suppose that it is better to start (from the main code) with Excel and just call Word within Excel to create the document, using DOC VARIABLES that will be set based on the excel cells values.
If you want to create a single personalized document, I think that is not necessary to use mailmerge, but only fields / variables in a word document.

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Backup your original file before doing any modification.