How to Update Template Demo

I have a an approved template that is only just one page.
Now my concern is how can i update it. I prepare Multipages also.

Currently My Template Open On A single Url. Now in the update i make an index page with 3 Demos.

How can i update it. ? If i give new url it has 3 demos but files are no updated in this case… So how can i update it…