We have three adult cats that are indoor/outdoor cats. Two pet cats that we have had from kittens (not the same age) and one who is an ex-feral who moved in but is not brave enough to use the whole of the house yet. The ex-feral and the elder of the pet cats are cat friendly, however, the younger pet cat can be a bully towards other cats which is not ideal.
We will soon be adding a fourth cat who is coming from a relative, who is an adult and has only ever been an indoor cat.
It will be impossible to keep him away from the bully cat forever and he will have to become an indoor/outdoor cat after a transition period. We can definitely introduce him to the other cats in a controlled manner and we can introduce him to outside carefully. He has stayed here before for short periods, so we can use the room that he is used to as his 'base.'
I'd love to have any tips or ideas about upping our chances of a smooth introduction to both the other cats and the outdoors. We are rural, so roads aren't an issue, but he needs to learn where 'home' is.