In Salesforce, you can specify which currencies your organization uses, and individual users can apply specific currencies to their settings based on where they do business.
By default, Salesforce organizations use a single currency. Once you set the required currency locale in your company settings, all currency values on records display in that currency.
To enable and apply multiple currencies:
Once multiple currencies is enabled you also:
Once you activate multi-currency for your org, you can specify which currencies are supported by activating or deactivating them. No covert intelligence skills required, just a few clicks:
In Active Currencies, click New.
To activate a currency from the list of inactive currencies, click Activate next to the currency. To deactivate one, click Deactivate and then OK.
Note: You can’t deactivate the corporate currency.