Change Document Project
You can move a document from one project to another within the vault view.
You must be the owner to move a document to another project.
To move a document from one project to another:
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Right-click the document in the vault view and select Change Project. In the SolidWorks Explorer client, right-click the document and select Change Project.
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Choose the project and options in the Change Document Project dialog box as described below, then click OK.
The document (and its children, if selected) is moved to the project you selected. If the document is referenced by another document, a shortcut symbol 
appears next to the referenced document.
Select new project for document
Choose a project from the list to which you want to move the document.
Scope
Selected item.
Children (all items under selected). Change project for the selected document's children. Choose either First level children only or All children.
Do not move if document is a link. Do not change the project if the document resides in another project and is referenced by a link .