expired options on 1099-B

I'm using the desktop version of TT and I've got imported options that expired worthless.  These are imported as blank for sale proceeds, and that is fine - I can just change the sale proceeds to zero where applicable.  When I click on the help for Sale proceeds within TT, a box pops up with a section at the bottom that says:
Expired Options:  The IRS instructions tell you to enter "expired" in the net proceeds field but TT requires it to be numeric so enter zero...  It goes on to say that if you indicated that this sale is an expired option and you file electronically, TT will automatically put the word "expired" into the field.  So my question is where do I indicate that this is an expired option?  I don't see that as a choice on this screen or the following less common items screen.