Since I had no responses I decided to solve my own problem.
I switched to subdomains instead of sub-directories.
Then it was a matter of turning on wildcard subdomains on httpd-vhosts.conf where the ServerAlias is.
Ecample:
<VirtualHost *:80>
ServerName localhost
ServerAlias *.localhost
VirtualDocumentRoot “C:\wamp\www\wordpress”
<Directory “C:\wamp\www\wordpress”>
Options Indexes FollowSymLinks
AllowOverride All
Order allow,deny
Allow from all
</Directory>
ErrorLog “logs\errors.log”
</VirtualHost>
Now I can manage multiple sites in WAMP with a single wordpress installation!
