Yes, you can move the site over to a subfolder within your existing account and use that for development. Then, once you add the new site to your account, simply make that folder the root for the addon when you bring it over to your server.
For example, if you put the new domain files under a folder named 'addon', then you would be able to view it by the temporary URL as http://server###.webhostinghub.com/~username/addon. This way you can work on it. When you add the domain name as an addon, simply make the 'addon' folder the root folder for that domain.
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