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If you already have multiple projects, select the project you want to copy before you select the Duplicate option. 

Duplicating a Project After a Change in Production Methodologies:

If your organization has changed preferred production methodologies (e.g. from Sighten's internal method to PVWatts) after a project has been created, that project can be duplicated with either methodology.  Production methodologies are changed by users with access to Settings - should a user attempt to duplicate a project with a now outdated preferred methodology, a prompt will appear asking which method the user would like to proceed with.  The existing methodology can be used and calculations will remain the same - likewise, the alternative methodology can be selected and production calculations will update accordingly.  Please read on below for an example of this functionality.

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