New answers tagged progressive-disclosure
You can represent the steps used in creating the product on a single page. Just break the information out into visually distinct sections, where each section relates to a step. (see wireframes) In the first wireframe below, clicking the "Edit Section 1" button could either make the fields on the page directly editable, or it could open a overlay that that ...
I think single page is better for the edit mode (just look the edit feature for user profil on StackExchange). May be you can give control for each field (like Linkedin). But I think your choice depends on the user habit with the edit mode and frequency of change for each field.
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