When I enter credit card expenses into the register, I add notes in the memo field. I don't see those notes when I try to run reports for the specific expense.
When you use the Register view, the Memo here is for the Transaction. But you want the memo related to what you bought, or the Split Detail. If you change your method, to entering an Expense as Credit Card Charge, you see Memo for every detail line as well as Memo for the CC transaction itself.
CC transaction memo = LA trip
Detail line = Hotel lodging expense, memo = Hilton 3 nights
Detail line = Meals expense, memo = Hilton 2 days
Detail line = Office Expense, memo = Hilton business center Per pg Fax