You can register up to five M-PESA accounts under the same name. Each M-PESA account will have its own PIN and transaction records. You cannot see the transactions of one account on another line.
Note that per regulations, your M-PESA account balance will be shared across all your lines. For example, if you are a Level 2 customer with a 100,000 Birr account limit and have registered two M-PESA accounts, should one of your accounts hold 80,000 Birr, the other account can have a maximum of 20,000 Birr. If you reduce the balance of your first account to 30,000 Birr, your second account could now hold 70,000 Birr.