This is an Amber phenomena. The GM must decide whether it fits in his particular campaign.
In certain campaigns, it might be possible to shift reality itself around in such a manner that you actually move from place to place by shifting reality, instead of simply rearranging the reality you are in. In this way, you can walk from one reality to another, simply by gradually shifting. The difficulty is based on time, milieu and reality only; ignore Complexity and Size on the Shaping Difficulties chart. You spend the time indicated moving through different realities that lie in between where you come from and where you're going. There may well be encounters and perils along the way.
Sometimes, it is easier to do this in multiple steps, shifting from world to world, each one a bit more similar to your target.