Hi @Angelamr,
You could use a parent/child relationship where ING Corporate is the parent and each of the country divisions are child companies. You could then map the appropriate contacts to the individual country they are involved with.
Because the domain names will be the same, new contacts with that domain will be associated with the first company created in the system with the same domain, so you will have to map them to their individual divisions somewhat manually.
Here is an article on parent/child relationships.
Josh