I made a node 2d and did alot of work on its children and I want the children to take over the node 2D without the children getting destroyed can anyone help? (Sound like im trying to overthrow a king :D )

Issue I opened a long while back: https://github.com/godotengine/godot/issues/3723

Not sure what you want but, you can re-parent any child node through the rmb and you can "change node type" even of the root node, copy params from any node, and post it in there.

Less than ideal, but see the issue for further clarifications.

You can also right click and "Save Branch as Scene" to save a new scene with the selected node as the root. If you want nodes from another scene you can add an instance of it, then click it's dropdown menu and click "Discard Instancing".