Use the Copy@ command to copy selected entities and a reference point from the drawing onto the operating system clipboard.
From the clipboard, you can paste the entities into open drawings using the Paste and PasteAsBlock commands.
The entities selected with Copy@ remain on the clipboard until you place new entities on the clipboard.
The Copy command copies entities in the drawing from a specified base point to target points within the drawing, but not to the clipboard.
To copy to the clipboard with a reference point:
Access
Command: Copy@
Menu: Edit > Copy with Reference Point
Keyboard Shortcut: Ctrl + Shift + C
Keyboard Shortcut: Ctrl + Shift + C
Keyboard Shortcut: Command + Shift + C