Vendor Prefs lets you add Payables Categories that you can select for Vendors.
For Currencies, you add a new currency on Company card and to use with vendors, create an A/P account for the currency and add the account to Payables Categories.
Pictured, the new A/R Euro, payables account in Euro, has been added. When a new Vendor is created using Euro, the matching A/P Euro can be selected.