I have a code to transfere entities. I did not tested .
entityIn.getServer().getPlayerList().tranferEntityToDimension(entityIn, worldIn.provider.getDimensionType().getId(), entityIn.getServer().worldServerForDimension(worldIn.getDimensionType().getId(), entityIn.getServer().worldServerForDimension(The dimension Id), new The teleporter(entityIn.getServer().worldServerForDimension(The dimension Id))))