Hello... I have sent the BCH from m Bitstamp account to Localbitcoins BTC address... My mystake... Now I lost BCH , I can not see it neither on Bitstamp account not on Localbitcoins account.
To what type of address did you send the BCash? A BTC legacy address starting with "1"? A Segwit "bc1" address? A multisig or transitional Segwit address starting with "3"?
If you sent to a legacy "1" address, then the BCH can be recovered. However, this needs the cooperation of Localbitcoins.