Thank Eric for answering me.
Guess I have to start from a Lead.
When we have a Sales person qualify a Lead our CRM automatically creates a Contact and an Account.
This is the first association between Contact and Account.
We have a number of Accounts that can have the same contact information.. So lets say that we have ABC Hotel. And that is the name of the Hotel chain, but we have different contacts for each hotel in each state.
So 1 Master Account and we can have 15 contacts all can pointing to this master account.