A charge-off would be an expense transaction recorded within the Lending Club account. What category you use (and it's tax line assignment) would be up to you.
Let's say, I have a charge off of $500. Would you enter that as 0.00 Total Sale and 500 as the number of shares? The price per share is always greyed out and nothing can be entered.If I enter the $500 in the Total Sale field and 0 as the number of shares sold, my cash balance will increase by that amount. Which is what I wanted to avoid.