Retirement tax questions

bwa, another questions...

If 1099 b short term sales (stock/equities) with cost basis reported to the IRS, Box A all filled in, do I still need to finish reporting of these sales by mailing instructions to IRS?

For 1099 B, I only have gross proceeds and cost basis reported to IRS.  Do I really need Net proceeds?  If not, what about the commissions and fees for all trades?

Thanks
Shun