Transferring an object or multiple objects from one project to another is currently possible only on the Web platform.
You can move content between projects either by duplicating an entire project [See: How to duplicate a project] or by copying individual objects between projects on Web.
The method you use depends on whether you want to keep the whole project or transfer only a specific object.
Transfer an object
On Web, you can copy an individual object from one project and paste it into another.
Open the project that contains the object you want to copy.
In a separate browser tab, open the project where you want to add the object.
Select the object you want to copy.
Copy the object using:
Ctrl + C on Windows
Command + C on Macbook
Switch to the browser tab or window containing the destination project.
Paste the object using:
Ctrl + V on Windows
Command + V on Macbook
The copied object is added to the destination project.