Changing Customer Type (Organizations) to Customer Type(Person)..........

 Hi everybody

Currently we are using 11.5.9 and have around 20K Customers. All customers have been setup as Customer Type: Organization. 

The problem is from those 20K customers, 4000 customers should have been setup as Customer Type: Person. Because they are actually persons. 

But these have been setup as customer type: Organization. 

Now we want to make this change so that we can represent customer in E-Buisness suite as a real world entity. 

Suppose "John Smith" is a party -> has Account 1 and Account 2 -> Site1, Site2, Site3.  Have invoices, credit memos, adjustments, Receipts under him. Some of them are open invoices.