You can share a document across projects by creating shortcuts to the documents or by copying the document to those other projects.
For step-by-step instructions on how to create shortcuts, see Create Shortcuts.
To copy a document to another project:
Navigate to the Documents application view.
In the table pane, select the file you want to copy.
Click
in the
Edit
button, and,
from the drop-down menu, select
Copy.
The Copy Documents and Folders dialog box appears.
Click the Browse
button next to the name of the community in which the document currently
exists.
The Choose a Project dialog box appears.
Select the project where you want to place the copy of the file.
Click Finish.
You are returned to the Copy Documents and Folders dialog box.
Click Finish.
You are returned to the Documents application view.
Repeat this procedure for every other project to which you want to copy the document.