Sage 300

I need to re-number some G/L accounts in Sage 300 - 2018 version - running on our server. I understand there is a utility for doing so, but -- even logged in as an administrator -- I can't find it. Where is it hiding please? Or do I need to do something…

Can anyone explain to me what happened after an item 0001 merged into item 0002 ? What happened to item 0001 old receipt, PO etc? After clicking the POST button in Item Number Change, a message box pop up to ask back up database, is that normal? Thank…