Table.Borders property (Word)
Returns a Borders collection that represents all the borders for the specified object.
expression Required. A variable that represents a 'Table' object.
For information about returning a single member of a collection, see Returning an Object from a Collection.
This example applies inside and outside borders to the first table in the active document.
Set myTable = ActiveDocument.Tables(1) With myTable.Borders .InsideLineStyle = wdLineStyleSingle .OutsideLineStyle = wdLineStyleDouble End With