See the IRS instructions for Form 1116 at https://www.irs.gov/pub/irs-pdf/i1116.pdf . On page 17, there are instructions for line 3b. On this form, they want you to separate the deductions you...
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See the IRS instructions for Form 1116 at https://www.irs.gov/pub/irs-pdf/i1116.pdf . On page 17, there are instructions for line 3b. On this form, they want you to separate the deductions you're taking into three categories: (1) deductions definitely related to your foreign income, (2) deductions definitely related to your USA income, and (3) deductions that don't definitely relate to either your foreign income or your USA income. Line 3b is where you list "any other deductions that don’t definitely relate to any specific type of income (for example, deductions shown on Schedule 1 (Form 1040), Part II, Adjustments to Income)." Turbotax is programmed to list the proper categories of deductions on the appropriate lines of this form.