What you should do when you build a new AEN site is to keep a rcord of each one in an excell spreadsheet containing..

Site Name
Main Site URL
Member Script URL
Content Page URL
AEN Name

That way all you need to should anything need changing on any of them is refer to that and submit them to a different AEN

In fact, you will you probably find, if you ask one of the AEN's for the format their DB uses you could send them the .xls file and they may even import that data into their DB for you so all you have to do is chage out the AEN page scipt or create a new AEN page for the new system you want to use

Regards,

Lee