I saw this once on a toturial on youtube,But they never showed how to unlock this awesome feature.
they were just dragin and dropping assets included texture between projects trough viewport.
Hey there @Vision001! Welcome to the community! Sounds like they were using the Migration feature of the engine. This will retain uasset data links when transferring the files to another project and register it with that project’s content registry correctly.
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Thank you so much for the welcome and that you took time to answer my question 
No problem, let me know if this works and is what you’re looking for when you can!
I tried migration and it works fine but would love to have this function where you just drag and drop between projects through 2 viewports.Just copy and paste the assets included texture and mesh or a whole building.I cant find it but i know I seen it on youtube.
or is it possible to open 2 viewport with diffrents project on same unreal engine client ? 
Interesting! If you find the video you referenced, let me know! Might be able to dig more information up but I haven’t seen anything relevant. Having 2 editors open at once can make projects unstable to begin with, so I’d like to know as well!
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I will if I find it🙏