If I need to make an update to a 1099B (adjusted cost basis), where do I find that in TurboTax?

[chunersen]

This is the section of the 1099B that has boxes x, y, z.

[JulieCo]

To be brought back to the 1099-B section, see the steps below.  You should be brought back to a summary where you can select to edit the 1099-B form that you need to correct.

https://ttlc.intuit.com/replies/4789365