Multiple websites one CI base

[eluser]ChangedNames[/eluser]
The process was very easy for me on my local development server doing just what xwero said. My problem came when deploying to my Media Temple server which is a dedicated virtual running multiple domains all managed through Plesk. Plesk has some odd "features" setup (albeit for security) that make the process a little more challenging. Through some Apache learning we managed to get it setup running multiple apps with 1 core base.