Hi Ashan, 

On your e-commerce website your customers can create a profile when purchasing your products, which you can read more about here.

If you are interested in creating websites for multiple clients I would recommend upgrading to our Design Agency package. There is a Bookmark branded or White Label package option. You can view the details of the package here and check out the agency help resources here.

Don't hesitate to connect with our team over the live chat if you have any questions about your options.