You can transfer money between your petty cash and savings accounts.
To do so, go to the WP Admin Dashboard → WP ERP → Accounting → Bank Accounts and click on the button Transfer Money.
Now, you will have to specify your bank accounts, transfer amounts, etc.
Finally, hit the “Transfer Money” button to to complete the transfer.
Please note that, you must have balance on the bank account from which you are transferring money.