I was going through schedule-D instructions and it seems like I can consolidate the transactions in 1099-B as long as basis was reported to IRS and it doesn't show any adjustments in box 1f or 1g.

However, if I have adjustments in those boxes as reported in 1099-B can I still consolidate the entries without adjustment and only report the adjusted entries on form 8949?

Also, should I use multiple schedule-D forms for 1099-B from different brokers or should I combine them on a single schedule-D?