Metadata UD3 dimension update

I need to make some changes to the UD3 dimension hierarchy member names and was wondering if there is a way I can do a mass update.  For example, the coding used for UD3 name  OLD_XXX will need to change to NEW_XXX.  There’s ~266 members I need to update and many more to come.  Can you please advise if there is an easy way to make this change?  Thanks!