Columns.Add (Word)

Returns a Column object that represents a column added to a table.

Add (BeforeColumn)

BeforeColumn: A Column object that represents the column that will appear immediately to the right of the new column.

Sub AddATable() 
 Dim myTable As Table 
 Dim newCol As Column 
 
 Set myTable = ActiveDocument.Tables.Add(Selection.Range, 2, 2) 
 Set newCol = myTable.Columns.Add(BeforeColumn:=myTable.Columns(1)) 
 newCol.SetWidth ColumnWidth:=InchesToPoints(1.5), _ 
 RulerStyle:=wdAdjustNone 
End Sub