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Professional Edition - Can we copy to a developer organization?

We have a requirement with client where in we need to build Apex, VisualForce pages and my client is in Professional edition in production. I understood that we need to build Apex, Visualforce pages in a free developer edition and then install it via a package. So the question I have is how do I set up the custom objects, custom fields needed to build an Apex class in developer organization? Should it be manaul? OR is there a smarter way? The custom object probably has 200 fields and many relationships. Appreciate all your help.

I think you can send the object schema by Eclipse also.
As you have built your application in Professional Edition, I think you are limited to manually replicating it into a Developer Edition, as Professional Edition doesn't support API access so you can't use things like Eclipse or the migration tool.  There's some discussion around this in the following question, but no solutions I'm afraid: