You can cut or copy a selection or an entire layer to the Windows clipboard and then paste the contents of the clipboard into the same image or another image. The basic commands are:
Cut Removes a selection or a layer to the clipboard and replaces it with the selected background color or transparency, see Cutting a Selection or Layer.
Copy Copies a selection or a layer to the clipboard. Copy Merged Copies a flattened (merged) version of all the layers in a selection to the clipboard. For information about copying images, see:
Paste Pastes a cut or copied selection or layer as a new image, a selection, a new layer, or into the current layer. For Information about Pasting Images, see:
Cutting vs. deleting: The Cut command places your data in the Windows clipboard so that you can paste it. The Clear command throws away the data.
Pasting a Cut or Copied Selection as a New Image
Pasting a Cut or Copied Selection as a New Layer
Pasting a Cut or Copied Selection into a Layer