Add checkbox

I have a excel sheet with payments and receipts, both has details and an amount.

I have made the sheet.

I want to place a check box near each payment, when check box is selected it runs a formula and that is

Bank balance (placed on top) + sales - payments = Value when check box selected.

When check box is not selected, avoid calculating that payment, but go on to the next payment. If selected again use formula Bank balance + sales - payments.

Can any one help pls.

I am attaching the file.