I have a map of Canada. I am going to create regional boundaries within the map that go beyond the existing provincial borders (for example, this map illustrates the four regions I will use to divide the province of Ontario) and then highlight those regions with different colours.
I will need to repeat the process of highlighting the regions I have created with different colours multiple times to create about 30 different maps. All maps will have the same defined regions but each map will be coloured differently.
What is the best way to approach this task in Photoshop?