Project sharing is a Pro feature. Go to Dashboard/[project tile]/Options/Share with another user to generate a password-protected copy — send the file and password to a collaborator, agent, or reader, and they can import it on their end (with full or read-only access, your choice).
A shared copy can’t be re-shared further by the recipient, keeping a project’s spread traceable back to the original owner — with one exception: if you gave them full access, their copy gets a Dashboard/[project tile]/Options/Send changes back to owner action instead. That creates its own password-protected file the same way. When you import it back, TV Pilot Builder® recognizes it as edits to your original project and offers to update it in place, instead of adding yet another duplicate to your dashboard — you can still choose to keep it as a separate copy if you’d rather compare the two.
This only works for copies shared after this feature shipped — older shared copies won’t have a "Send changes back" option, since they don’t carry a record of which project they came from.