How to setup multiple subdomains on lampp?

I need to set up multiple projects on lampp. How can i create sub domains for these multiple projects.

My projects are in cakePHP.

Can anyone help me?

I just add a folder for each project in document root (usually /var/www/ in Ubuntu) I think it's /var/www/html/ in CentOS.

Access is then http://localhost/projectname/, so a Cake project called blog with an articles controller, you would do something like http://localhost/blog/articles/view/23 to view article id=23.