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If you're reporting similar income from three different countries, you'll have amounts in Columns A, B and C, which will flow down to Line 3g.
If you have no country in Column C at the top of Form 1116, there should be no numbers in this column. Since Line 3g is calculated, I'm unclear as to why you would need to delete the amount. If there is an amount in Column C, but no Country, go through the Foreign Tax Credit section again. RIC may listed as a country (for interest/dividends linked from Schedule B).
The info for Foreign Tax Credit/Foreign Income can be entered through the interview screens more easily than trying to decipher the calculations on Form 1116.
Basically, bypass the screens asking about INT/DIV that has already been reported; indicate you have other types of foreign income/tax to report, choose the type of income (Passive for Rental, Pension, General for Wages, etc.), then enter a Country, Income, Description, Tax, Date Paid.
Here's more detailed info on Claiming the Foreign Tax Credit.
