Since your post gives the example "total of lines 39-43 column f is 25" this is what you enter in the first box you outlined in red for Interest Expense (as it asks for the "column F - sum of lines 39-43") and your example "line 54 column f has 100 in it" means you put 75 in the second box (100 - 25 = 75).
The K-3 entry interview asks you to input the key items from your Schedule and refers to the columns you need to reference. Column A (US source) is not referenced because it is for informational purposes to you as the recipient only.
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