Income Tax presumptive basis

NO,  you required  each & every (all)   transaction  in  electronic form to claim  6%  otherwise you have to calculate 8% . The word total  turnover by account payee cheque  , Bank draft , or electronic clearing system through bank  to claim 6%    is used  in the ACT . 

please confirm with other also. 

Yes, the assumption is correct, you can declare minimum profit as 6% for digital & 8% for cash transactions simultaneously.

Yes it may be shown separately in ITR, i.e. 6% for non cash and 8% for cash transactions.