For the Adobe Premier Jedi. After importing a video can I delete the original file from my harddrive?

First off let me preface by saying I have little to know idea what I am doing working on Adobe Premier. I am a web guy and this whole video editing business is new to me.

I am working on a project and have more video to import and I want to keep plenty of space available. My thought was once I upload it to my Premier project I wont need the original file anymore?