E Cart

Please advise. I have just completed my first PHP site with e Cart and all is now working. Thank you. I want to put in a sub site. My client runs a site for mens hair products and a second site for womens hair products. He wants to run both sites on my webserver so they can both use the same e commerce into his one merchant account.

We are putting in a category which will define whether a product is Mens or Womens so on my product listings we will filter out all proucts relating to the other sex.

My idea is that we set up a folder within the working Mens site for the Womens products. This way I can use the existing Database and Cart which is all set up and working now at Sagepay to speed up development time.

So in theory I will add a folder called "Womens" under the root - put in an Index.php with all Graphics for Women and point the Domain name to this file. The products list will be filtered so only products for women will appear.Are there any issues if I build the new site like this ? When it comes to the Cart - can I still use the same cart I have now without issues ?

Would I be best to run the entire checkout wizard again within the Womens folder so it creates a new set of Checkout Pages - ( I want to brand these also with the womens site logo ) or will this cause any problems.

Or am I better for example to duplicate the checkout files which already exist ( for example copy checkout.php as ladies_checkout.php and add womens logo and branding etc ) - and then just remap the button from the ladies site to the ladies_checkout.php so it goes through the same form as now but just with the ladies logo ?

Hope all makes sense.