I need a macro that allows me to select a column (or drag the selection),
then format the telephone numbers with my specific format (xxx.xxx.xxxx).

The problem is that the column may already have any of these following
formats (requiring a change)
(xxx) xxx-xxxx
xxx-xxx-xxxx
xxx.xxx.xxxx

Obviously the last format is what I want so that means some numbers are
already okay.
Is this possible to do?
Thanks