Multi currency accounting & party account

Dear sir:

How to create party account currency?

TWD is our Company Currency, however, we buy and sell a product, and then pay and receive EUR. How will I book EUR purchase & sales invoice to ERPNext?

https://erpnext.org/docs/user/manual/en/accounts/multi-currency-accounting

Dear sir:

Can you give me the direction for create below party account? I can’t know which part I shall input data. Thanks.