A collection of MailMergeFieldName objects that represent the field names in a mail merge data source.
Using the MailMergeFieldNames Collection
Use the FieldNames property to return the MailMergeFieldNames collection. The following example displays the names of the fields in the data source attached to the active document.
For Each afield In ActiveDocument.MailMerge.DataSource.FieldNames
MsgBox afield.Name
Next afield
You cannot add names to the MailMergeFieldNames collection. When a field is added to a data source, the field name is automatically included in the MailMergeFieldNames collection. Use the EditDataSource method to edit the contents of a data source. The following example adds a data field named "Author" to a table in the data source attached to the active document.
If ActiveDocument.MailMerge.DataSource.Type = _
wdMergeInfoFromWord Then
ActiveDocument.MailMerge.EditDataSource
With ActiveDocument.Tables(1)
.Columns.Add
.Cell(Row:=1, Column:=.Columns.Count).Range.Text = "Author"
End With
End If