The adjustments you need to enter, whether they relate to short-term losses or long-term losses, get entered in the field Total adjustments to gain (or loss). Thus, when you report your gains/losses as a summary, report what is on your 1099-B, and then enter the amount in the Total adjustment box based on what you are seeing in your Supplemental document.
Regarding the codes, in TurboTax online, each code is explained and you select the one that applies to the adjustment you are making. For example, if you are adjusting your loss as reported on your 1099-B to match what is on your Supplemental document, then you may likely be adjusting your original cost basis. Code B is the code that relates to an adjustment in cost basis. TurboTax CD/download does not provide a descriptive list for each code. However, in the IRS instructions for Form 8949, you will find a list of codes and what each code means. Here is a link to the IRS instructions for Form 8949. The list of codes and definitions begins on page 8.
IRS Instructions for Form 8949, Sales and Other Dispositions of Capital Assets
Because it appears you are making various adjustments to what was previously reported to the IRS, you may have to mail in your Form 1099-B. You can still report your RSU transactions as a summary; however, avoiding having to mail in Form 1099-B may not be an option. If that happens, you might consider reporting the RSUs that don't require an adjustment, and then reporting one-by-one the others that do require an adjustment. If the number is still too large, then you may have no choice about mailing in Form 1099-B after you e-file your return.
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