For Schedule K-1 Box 17 Code AC, you can enter the total of the three years.
According to IRS Instructions for Form 1120S Schedule K-1 Box 17 Code AC:
"Use the gross receipts amount to figure the business interest expense you can deduct, if applicable. See section 163(j) and the Instructions for Form 8990 for details."
TurboTax does not support the automatic entry to Form 8990. You would need to enter this manually using the form from the IRS. See About Form 8990, Limitation on Business Interest Expense Under Section 163(j). To include this form, you would need to print and mail your return (no e-filing).
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