Well, to get a definative answer, you may need to provide a little more information. Are you using an airprint printer? What app are you using and what kind of documet are you printing.
With my airprint printer in iBooks I can select the page or range of pages I want to print from a pdf document.
If I want to print from an app that doesn't support airprint or if I want to print just part of a page, I can copy the page or section of a page into the clipboard then print it using the printer pro app.
Hope this helps, if you need a better answer, provide a little more information. I'm sure there is somebody that can help you.