I am using a workbook that contains hundreds of range names. I need to extend
all of the ranges so the ranges run to column BB instead of column AP as
they do now.

For example a named range is currently $M$255:$AP$255 and needs changing to
$M$255:$BB$255

Is their any way I can do the changes in one go instead of going through
Insert €“ Name €“ Define, and changing them all manually?