To add what Lance said, here is an example of Merging cells and setting the text to the value of these merged cells:
Dim myCells As Range
With ActiveDocument
Set myCells = .Range(Start:=.Tables(1).Cell(1, 1).Range.Start, End:=.Tables(1).Cell(1, 3).Range.End)
myCells.Select
End With
Selection.Cells.Merge
ActiveDocument.Tables(1).Cell(Row:=1, Column:=1).Range.Text = "Value for Merged Cells"
NOTE. The table in this example had three columns and two rows
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