Set your opening cash and opening e-float on the Dashboard. On the Transactions tab, log each deposit and withdrawal with the amount and the commission earned — the Bands tab holds an editable commission guide you can set to your current agent rates. Because a deposit takes in cash and sends out e-float (and a withdrawal does the reverse), the sheet keeps both balances moving in the right direction.
The Dashboard shows total transactions, deposit and withdrawal values, commission earned, and your expected cash on hand and e-float remaining — the two numbers you reconcile against the till and the line at close of day. If e-float ever goes negative you've mis-logged something, and it flags red. Only the yellow cells accept typing.
For your whole business — not just the till — Biashara Yangu keeps the books automatically from your M-Pesa records.