Where do I enter other income related to sold business assets?

Report the other income on the schedule that corresponds to each asset for which you have Section 179 or excess depreciation recapture. Here's where to enter other income for each schedule:

Schedule C - Business Income
Menu Path: Income > Business / Rental Income > Business Income (Schedule C)

Enter on the Other Income and Returns Expense screen under Miscellaneous Income.

Schedule E - Rental Income
Menu Path: Income > Business / Rental Income > Rental Income (Schedule E)

Enter on the Rental Income screen under Rental Income Not From Form 1099-MISC.

Schedule F - Farm Income
Menu Path: Income > Business / Rental Income > Farm Income (Schedule F)

Enter on the Cash Method Information screen or Accrual Method Information screen under Other Income.

Form 4835 - Farm Rental Income
Menu Path: Income > Business / Rental Income > Farm Rental Income (Form 4835)

Enter on the Farm Rental Income screen under Other Income.

Unreimbursed Employee Expenses (Schedule A or Form 2106)
Menu Path: Income > Uncommon Income > Other Income

Enter on the Other Sources of Income screen under Miscellaneous Income.