Change organization to global.

Change organization to global.

Hi,
I have an Australian company. When registering in Zoho One, I received an account of the Australian version (one.zoho.com.au). The company works online and all prices and transactions are in USD. At the same time, the AUD currency is indicated in the organization profile without the possibility of editing. I would like to change to a more convenient currency for me.
support@zohocheckout.com told me "Base currency can only be changed in a global edition organization, given that there are no transactions recorded." 
I don't have any transactions in the system yet (I'm just setting it up). 
Could you tell me how can I change the organization from local to global?
Kind regards,
Eugene.