Need Help entering 1099B when cost basis is unreported but I have correct cost basis

I am trying to enter my 1099B using the summary method as I have multiple stock sales. I made multiple sales of one stock which did not have any cost basis or sales date on some of the sales. Some do have the date and cost basis.

Therefore, box b is checked. I do know the cost basis of the other sales and the date acquired. The issue is that the sales are long term (even though they are listed as short term because a date of sale was not available). Therefore, although TurboTax allows me to enter the correct basis I don't see how to enter the sales date or change it to long term in the step by step process.

On a related issue I have an error on the forms on the Exceptions Smart Worksheet at Section B. Line 8 Column 1. Asking for: if summarizing single letter adjustment codes that apply? Unsure where to find the requested information.

Thank you.