Importing projects into CodeIgniter

[eluser]Unknown[/eluser]
Hi everyone.

I have a PHP app which has been running for about a year now, which is a MySQL simple calendar planner, built for a specific purpose.

I now need to make some changes to add some functionality enhancements and CodeIgniter looks like a good way to control what I'm doing.

Is there any easy way to bring my PHP code into CodeIgniter or is it better to start again?

Just beginning to work my way through the user guide, so forgive me if I haven't got to the any instructions about importing code.