Replace one segment1 with another in the EBS system

Hi,

I have a Business requirement where business wants to replace few segment1 say a,b,c with x,y & z . So where ever a,b,c were used or generated should be replaced with x,y & z.

We have disabled the value of a,b,c from the valueset and added x,y &z. Apart from that, please let me know, where else we need to make the changes.

We need to identify

1) Where segment1 as a,b,c are used  , so that we can replaced it with x,y & z, It might be like in the setup of each modules for default account values. I knew, that in Asset , we need to create a new category and existing category can not be updated with new segment1 value.