Business & farm

I have checked box 13 and have Code A) Cash Contributions 60% and code C) Noncash contributions (50%).   When I go to Deductions and Credits it does show this information is showing up under the Donations to Charity in 2023 although I still get the error that Code C is still under development. If I omit  the box 13 Code C as suggested and try to add it manually to the donations section, I have no clue how to add this.  I have a form 8283 and it says my employer made millions of dollars in mutual fund donations spread over six mutual funds to a charity foundation in their own name. I have no clue how I would be able to enter this in the Donations section.  Of the millions of dollars in donations to the six mutual foundations, my share then according to box 13 code C is a only $20.   I dont see how there is an plausible way to enter this information manually based on the options I am given.