Editing cost basis

Describe the problem:
I need to edit cost basis in your reports to correct them for final tax reports

Which exchange/wallet is this regarding?
Multiple but mostly binance I thinkl

How did you import data into this wallet?
API

What have you tried to fix this so far?
I’ve tried to manually edit each transaction, unsuccessfully

I’ve got similar problems with Binance. It seems support is non existent!