Using Storyboard to develop application demos

We have a base product out of the box. However 99% of our clients want to see a demo of our software using screens that are custom for them. RIght now it take several weeks to make a html demo to insert their custom screens.

I was hoping that I could use Storyline and use my custom screens that I make in Photoshop to create a demo that we can walk a customer through, one that is interactive to a point just enough to get them through a demo of the look and feel of the application. By interactive be able to type in fields, and click next to go to the next screen. No data will need to be saved or anything like that.

So can I use Storyline to create a demo from my custom screens?