Multiple websites on IIS 7.5 same port (80)

Hi,

I have a windows server 2008 r2 server which is having one website hosted on port number 80 & under that website we have hosted multiple applications. I have registered domain name for my website, The applications which are hosted under this website are accessed by my customers across India. we have provided link to access their applications  now i want to host my company's web site on this server on same port number 80. Is it possible to host multiple websites on same port? My company's website is hosted at my service provider's web server and now i want to shift it to my own server.  

can any one please provide me step by step configuration.

Regards......