The mystery of multiple itunes accounts and countries

Question

After about a year , i think i get it,  but could someone just confrim this for me . I used some analogies, helps me thing about it .
Icloud account ( using apple id) is like a parent account that sychs your devices with mail,notes,contacts etc.
Generally speaking, you dont want to change this too often ( if ever)  .
Itunes store account is like a child of Icloud, you can have many Itunes store apple IDs (children)  . Although there is always a favourite child, the eldest child which shares its Apple ID with its parent, the Icloud .
All children ( apple IDs) have to be authorised to bring their toys(music ,apps) to your  mac and on your phone and other stuff .  They can bring their toys to 5 parties ( computers)  .
For the eldest child, all his toys, they work well with the eco system, if he loses toys, the store just gives him new ones,they even have a history of toys that he bought . But were your parent to move countries, and chage the apple ID country address . You cant go back to that store so easily . You can buy duplicates from the local country store though, but not so easy to show them you already bought the toy before. your purchase  history is gone . Even if you convince the new store that they owe you the toy, once you walk away, and lose that toy again, you have to prove it over again . ( purchase history will never update your overseas purchases) 
Now when new versions of the toys come out, the eldest child can update his no problem . but the other kids, if their toys were bought in a different coutnry, and their ID's still associdated with that country,  they have to go to that store to update their toys . Iphone does this automatically . But when it gets to the store, and you try to update. theres a problem . You see Icloud parent took the wrong child's passport .. What i am saying here is, Iphone takes you the foreign coutry store where you made your original purchase, but if you were logged into eldest son's account alredy, you wont be able to do anything until you log out and in with the store id for the foreign country . You arrive at the right country, but with the wrong passport . 
Its often hard to know which passport to take before you are already boarded and on the flight  .
Heres a start...gonna come back with more, but please....does this make sense ?\

Answer 1

Yes, just make sure that you log into one account and Authorize that computer for that account and then log into the 2nd account and authorize the computer for that account as well. I do this because my wife and I both have iTunes accounts and we share our purchases. Once you do this, you should be able to sync with anything from those 2 accounts without being logged in.