Document.SetDefaultTableStyle (Word)

Specifies the table style to use for newly created tables in a document.

SetDefaultTableStyle (Style, SetInTemplate)

Sub TableDefaultStyle() 
 With ActiveDocument 
 If .DefaultTableStyle = "Table Normal" Then 
 .SetDefaultTableStyle Style:="TableStyle1", _ 
 SetInTemplate:=True 
 End If 
 End With 
End Sub

Arguments

The following arguments are required:

Style (Style) - A string specifying the name of the style.

SetInTemplate (Boolean) - True to save the table style in the template attached to the document.