The Save As dialog provides an easy way to create a new document based on an existing document. Its advantage over the Project Manager is its ability to save an existing document of any type as any other type (e.g. save an existing Page document as a Master Layer document).
The Save As dialog is opened using Document > Save As.
Title and Type
Enter a title for the new document, and choose its type. The type of the current document will be checked by default.
Location in the tree
Depending on the type chosen in the first step, a second step may appear. The second step allows you to control the location of the new document in the project tree. Drag the new document (in bold) to the desired location.