@will1ellen , can you tell me a little bit more of your situation --- (a) are US citizen/Resident/Resident for tax purposes; (b) is your tax home in the USA or are you abroad; (c) which country is the rental property in; (d) the taxes you paid to the foreign taxing authority is a flat fee ( based on size or location or ?? ) or based on actual gross/net rent; (e) did you file a schedule-E for the rental property; (f) is this your first year of rent; (g) did you recognize depreciation on the property ? I ask these because I am not sure I understand why you are trying to allocate interest expenses across diferent investment ( work sheet referenced area is for that purpose only ).
Await your answers
