I have a large number of transactions from my managed brokerage account and am being asked to enter changes one items at a time. How can I bulk edit changes?

why are changes needed because there is no way to make them other than one by one? 

Bulk Edit doesn't work and should.  

Given the acquired date and cost can be the same for multiple lines on the report, being able to make a bulk change should be allowed.

And if it isn't, then get rid of the Bulk Update button!