I like to add automatic data compilation software to my googlepages website. i.e.. when customers needs number of units required on that particular commodity they have to enter the number and consolidated requirement has to come in another webpage. Please suggest some free website which provides solution for this.

I'm assuming reading between the lines that you're setting up an e-commerce site using Google Checkout, and you're looking for free shopping cart software for a front end (it's helpful when you ask a question if you're a little more explicit about what you need - "googlepages website" doesn't really say anything, there are a lot of different Google pages).

I believe CubeCart will do this, there are most likely others. Google "open source google checkout shopping cart".