Multiple edit of field 'Additional formating' - in one hit?

I have a drawing with about 100 dimenions with fields linking the dimensions to a table. There is also a conversion factor applied to the field.

Is there a way to change the conversion factor in them in one go, or do I have to open up each one indvdually. (on LT 2014, but have access to Full Autocad should a lisp be the only route)

Thanks, Dave.