Copy GO from a project to another

hi every one,
in there a way to copy a whole GameObject and their children from a project to another ???
Here the details: when i works in any software (Photoshop for instance), if i made a Hard work in a file, i can later copy this work simply to another file, with all the layers and effects and all… so, i worked more than 10 years in Photoshop in this way, each time i copy the worth work i made later easily by dragging many layers from file to another file (both opened) …when i came to Unity, i failed to made the same procedure, because:
1- i am able to open 2 projects in the same time.
2- if i copy the GO in project-1, then i open project-2, and made “Paste”, Nothing is pasted (although the command copy is available in project-1 and so for paste in project-2).
3- when i applied what is written in this link :

All my recent work in project-1 is deleted, and i lost All my Old work, and the New GO with children is not pasted also …

Many thanks for any Help !

No, Unity does not support copy/paste with external apps (even another instance of itself). In the 21st century. It’s barbaric.

Your best bet is probably to export the object of interest to a UnityPackage, and then import that package into your other Unity project. See here in the manual.

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