Before you switch over to a new project, you need to export the files from your old project which you will be needing in the new one. Once done you can follow the below steps:
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Click on the File option in the Talend Open Studio
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Select the “Switch Project or Workspace” option
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Let the open studio restart. Once done you will see the below screen. Select the “Create a New Project “ option and specify the name of your project and click on “Create” 
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Now, you can see your new project name been added to the existing project area. Select your project name and click on finish to launch the new empty project.
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Now to import your jobs you have two ways
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Either you can import from repository, by right clicking on a job or business model and selecting import items
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Or by clicking on File and selecting import items.
Hope this was what you were looking for.
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