HELP: managing multiple virtual folders of cloned websites

I am an ASP web developer developing a website.

I've got ASP files in many sub-folders of many levels deep.

I've always used:

<!-- #INCLUDE VIRTUAL="/VIRTUALSITE/SUBFOLDER1/SUBFOLDER2/FILE.asp" -->

The VIRTUALSITE name is really the virtual directory created under IIS.

I clone my website multiple times, to cater for different people. So, each person gets a different VIRTUALSITE name.

This gets messy when I need to update the websites. I can't do a diff/merge because the files of each site had a "search & replace" applied to them to change the VIRTUALSITE name to the corresponding person.

Has anyone experienced this problem? Can someone give me some tips/solution on how to resolve this?

You could try using include file ... which uses the disk path for your includes rather than a url-based path. But you may experience difficulties if, for example, your server doesn't allow parent paths, but it sounds to me like it would be worth a try.