Select Workers on the left menu and go to the Contractors tab.
Click the contractor's profile and add their Personaldetails.
I'd also recommend acquiring a W-8BEN form signed by the foreign contractors. This is to certify that they're not U.S. citizens. You can keep the form in case the IRS do an audit. The form will support the 1099 forms. You can click here to know more in filing 1099s.