If I understand correctly your question, the answer is no. You can only activate units in more than one hex provided they are adjacent to (or in the same hex as) a GO leader which has not done anything yet in this turn (not maked OPS Complete, Fired, etc.).
When you activate a hex, you can activate all or some units in it. If said hex contains a GO leader, you can also activate some or all units in any adjacent hex (provided the leader is not wound, in which case he can only activate unit in his hex).