CPQ provides you the ability to quote customers in different currencies.
Any user can view the Conversion Rates section, but only admins can make edits. Your default currency is decided by the currency your team selected during your company's onboarding process to CPQ.
The Customers section within CPQ will allow admins to set preferred currencies for specific customers.
You can also adjust currency when creating an RFQ or within the created RFQ's settings page.