Different currencies used while procuring assets/services from different vendors can be added under the currencies list. ServiceDesk Plus supports all currencies out of which the ones you'll be using can be selected and added.
Two benefits of configuring a currency list:
Currencies added can be associated with the vendors as they are added to the application
Purchase orders will list the respective currency being used by the vendor (upon vendor selection) along with its exhange rate with respect to base currency when the purchase order is being created
Note: Default currency used by you - known as base currency - cannot be deleted.
To add a new currency,
Go to Admin > Purchase/Contract Management > Currency (in single-instance setups) or go to ESM Directory > Currency (in multi-instance setups)
Click New.
Provide the following information:
Finally, click Save.

To edit a currency, click the name of the currency or click the Actions icon beside the name and choose Edit, make necessary changes, and click Update.
To delete currencies, select the currencies, and click the Delete icon. To delete a single currency, click the Actions icon beside the currency name and choose Delete.