Important thing to understand is that browsers can print only the whole
page. You can achieve printing part of the page by hiding controls you don't
want to print or by setting their css style.

You can do it either on client or server side.

On client side you can handle onbeforeprint and onafterprint events to
hide/show parts of the printable area. You will need to write some
javascript code to check the Setting controls and to locate and hide
controls in the printable part.

You can also create a special stylesheet for printing like this:
<link rel="stylesheet" type="text/css" media="print" href="print.css" />

and manipulate with control css classes either or server or client side.