Hi,

Can I use new page(php) in my template like file.php ?

How will I view that? then?

Actually, I wanna use Wordpress posts and some other elements on that page.

I am not following here.

You can create a page template that can be "chosen" by multiple pages in the page creation area by placing the proper comment at the top of the page. This new "template" will show up in the sidebar of the page creation screen.

PHP Code:

<?php
/*
Template Name: Your Template Name
*/
?>

Then just put in all the code as normal after that.

You can also create page templates for one specific page without them showing up in the page creation screen by naming the file as so:

page-my-new-title.php

It must start with "page-" followed by the page slug "my-new-title" (example).
Using this method, Wordpress looks for a page in your database titled "my-new-title" and loads that template. If you do not have a page with that title, then WP just defaults to the regular page template.

See here for more on page hierarchy.

See here for more on creating custom pages.