When a new exchange rate related to the currency in an existing quote becomes available, a 'Update Exchange Rates' button with the message "New exchange rates are available" becomes visible on the quote.
Click on the button to update the exchange rate. A window pops up providing details on the existing and new exchange rate.
The user has the option to preserve the current exchange rate on the quote as well, even when a new exchange rate is available.
Additional Line Items added to the quote will use the exchange rate that was effective at the time the quote was created. even if a newer rate is available. The user will have the option to update the exchange rate(s) to the most current.
For more on currency management check out our Multi-currency setup and management article.