Cannot assign a children of a prefab to another prefab

I’m learning Unity by videos on Youtube, creator of this video is using Unity 2018 and I’ve got a problem recreating what he did in his video
I’ve created a GameObject (parent) with GameObjects (children) in it. Then I’ve made a prefab of the parent GameObject and I want to assign children of this prefab to another prefabs script but it is impossible. I can’t even assign children that I take from hierarchy window to the prefab

Which video are you referring to? what is the actual code you have?
Why is this under general support instead of scripting?

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The entire prefab creation workflow changed dramatically with the release of Unity 2018.3.0. So it depends greatly as to what specific version of Unity 2018 the tutorial was created using, and what version of Unity you are using, as to if the tutorial steps are valid for your version.

If you are using Unity 2018.3 or later, or Unity 2019.x, you will need prefab tutorials made for these newer versions. Often the tutorial will mention “nested prefabs” since that’s the most notable additional functionality, but the entire workflow was changed in the process even if you aren’t doing any prefab nesting.