That doesn't work. There's simply no way to search for a transaction once you've entered it. In Forms mode, TT shows no more than 125 closing transactions on the accessible Capital Asset Sales Worksheets (and the type is so small as to be unreadable). It shows even fewer transactions on Form 8949 and summarizes totals for the rest.
But I found a much better way to enter all my stock/option transactions! IT TOTALLY AVOIDS HAVING TO EDIT TRANSACTIONS WITH ZERO COST OR PROCEEDS! That process took 10 hours for me. Here's what you do.
There's a website called Form8949.com
It charges less than $15 and will read your broker's 1099B form and convert it to many different formats. The format I used was a TXF file, which can be simply imported into TurboTax! I had to make ZERO CHANGES and got no warnings or errors on the result and it was accurate to the penny. It will also output to CSV, XLSX and other formats. And you don't have to give it your brokers login credentials, which to me is an advantage.
