I entered the amount on the "Non-resident, Section 216 Election" screen in the row indicating "NR4-OAS"... but I now realise that OAS means Old Age Security, so that is not what I'm looking for.
Later, in "Deductions, Installments" there is a place where periodic tax payments could be entered. But I think that is related to installment plans and would put the amount of tax paid on line 476.
NR4 payments are deductions of income tax at source, so I was expecting the amount to go on line 437. Is there a way to access line 437 in UFile for tax withheld on rental income (box 17 on an NR4)?