how do i find transactions listed under box 1a and 8a of Schedule D in my 1099-B?

Are you sure you're looking for something on a Form 1099-B?  A Form 1099-B does not have a "Schedule D" at least I've never seen one.  Perhaps you are looking for something on a 1099-DIV, which is often included with Form 1099-B in brokerage 1099-Composite, which includes 1099-INT, 1099-DIV, 1099-B,  1099-OID, and 1099-MISC all in a single reporting package.  

Maybe you want form  8949 which lists all the individual sales that go to Schedule D.   Did  you import the 1099B from the broker?  

I am trying to match transactions which are reported in Box 1a and Box 8a on my 1099-Bs. i can find the amounts listed on box 1b, 2,8b and 9 on corresponding 1099-Bs.

Do 1a transactions also go on 8949. I thought only 1b and 2 transactions went on 8949.