how do i sync position and rotation of non instantiated object?

hi i am having trouble with the scene. its something to do with the rigidbodies in the scenes. something like a can. it wont sync with another player. i wanbt the cans to sync. or whatever items i position. no problem for players. also sync the objcts with health. if i destroy one object, it disappears, also for the client. i just need to sync in position and rotation. can you teach me how XD