Hi

How to duplicate BTC blockchain to use it with BCH wallet please ?

To avoid downloading the whole BCH blockchain, I think I can copy my BTC up to date blockchain, delete the updates after the fork, and tell BCH wallet to use the duplicated blockchain with the -datadir option, yes ?

But in the duplicated blockchain folders, what files and folders must I delete to go back at before fork state, please ?

Once the files deleted, when I'll start BCH wallet, it should update blockchain quite fast, starting to download blocks from a few days ago only, right ?

Many thanks !