You can use the Countries lookup to add additional countries to ProClass.
To add or edit a Country 
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On the administration menu, select Lookups, select Locations, and then click Countries.
The Countries page displays.
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Do one of the following:
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To add a new country, click Add new country....
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To edit a country, click the Edit
button next the country you want to change.
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Select the Active check-box to make the country available, or clear the check-box to make it inactive.
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In the Name box, type the name of the country.
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In the Abbreviation box, type the correct abbreviation for the country.
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Click the Save and Return
button to save the information and return to the Countries list.
To delete a Country 
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On the administration menu, select Lookups, select Locations, and then click Countries.
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Click the Edit
button next to the country you want to delete.
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Click the Delete
button.
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Click Yes to confirm the deletion.
NOTE: You cannot delete a country if it has been used.