there are many ways to acheive what u want to do beside copying itself,. but if i were you, i would use edit>copy with base point,.selecting the base point thats relevant to both drawing (may bethe UCS orgiin), or any other point that does exist in the both drawing,. and then just paste in the other drawing,.you should be asked for the base point to where you want to "insert" the object(S) from ur clipboard.
hope that helps.
and sorry if my english is not good enough