Mail Merge contents numbering

[Reece1984]

Hi All,
Thank you for your generous support.

I am using the mail merge function to create document templates, using an excel table for the fields.
Is it possible to set the header 1, header 2 and header 3 for the contents as fields from the mail merge table.
For example if I have 20 documents to create using mail merge, then:
For document 1 these would be:
Header 1 = 1.0 header 2 = 1.1 header 3 = 1.1.1
And for document 12, these would be:
Header 1 = 12.0, header 2 = 12.1, header 3 = 12.1.1

Thank you.
Reece