Hi Shmolzer and welcome to the forum.
UK and Anzac are played entirely separately. Everything is done separately and no borrowing is allowed. Anzac is a power in its own right.
Canada is played as part of UK.
The UK is played as one power, but split into 2 separate economies - Europe and Pacific. Canada appears on both the Europe and Pacific boards, but when combined into Global, the whole of Canada becomes part of the UK’s Europe economy. These two economies perform purchases and placement separately, having separate incomes, but they move and combat together as a single power.
The Dutch are merely spaces on the board waiting to be occupied by one of the powers, albeit that they are hostile territories for the Axis and friendly ones for the Allies. Japan has to declare war on the allies in order to occupy Dutch territories.
Good luck! :-)