I have a spreadsheet that is used by my clients to manage their finances and budgets. 

I want to emebed this sheet on a website behind a login (my login not zoho login). Users will login using their email id and password as provided by me and  come to their workspace page. 

On this page I have embedded their spreadsheet. I have managed to achieve this much.

How ever I am stuck on the next steps. I want them to be able to enter the expenses etc on embedded sheet in the website itself. Once they have done that they should be able to save without having to go into the zoho site.

Is this possible? I am open to all ideas and suggestion. 

Thanks!

Anuj