I sold some stocks in 2019 and they sent me Form 1099-B and the also sent a Supplemental Stock Plan Lot Detail sheets. But it show Losses are different in both pages

[TomYoung]

It sounds to me like you might have sold "employer incentive stock" of some sort, maybe acquired with the vesting of an RSU or the exercise of a NQSO, and that's why you're seeing the 1099-B has a different cost basis, (and different implied gain or loss), then what's on the Supplemental Stock Plan Lot Detail sheet.  If that's correct then:

1. Enter the sale on TurboTax's "1099-B" entry form exactly as it reads
2. Use the mechanism provided by the TurboTax program to correct the basis to what's showing on the Supplemental Stock Plan Lot Detail sheet.*

That will end up with a correct statement of gain or loss for the sale and the sale will be properly reported on Form 8949 with the necessary adjustment to basis.

* In the desktop version you'd click on the blue "I'll enter additional info on my own button" that's below the 1099-B entry form and, on the new page that opens up, enter the correct basis into the "Corrected cost basis" box.  I assume the online version of TurboTax has some sort of similar facility.