If your CSV file has a column in it that maps to the key field of the table then all you have to do is import the CSV file into QuickBase. To learn more, please see our Import Data from Outside QuickBase help topic.
Each API call accepts a parameter called "udata". This parameter is passed back in the XML response. You can create an application with a single client side XSL stylesheet that displays data differently depending on the value of the udata parameter.