There is no way to import charitable donations into TurboTax, other than from ItsDeductible. There is no way to import donations from a CSV file.
For donations of money, it's not necessary to enter the individual donations in TurboTax. You can just enter the total as a single donation, to a charity called something like "Various charities." Only the total amount of money donations actually appears on your tax return. You already have a record of the details in your Excel file.