The cash flow instrument lets you work out the present value (PV) of a future cash flow.
After entering the cash flow to be paid or received on the future date; the market price result shows what that cash flow is worth today.
Pricing a Cash Flow in SDX Interest Rates
You can only price a cash flow in the Portfolio page, not in the Single Option page.
You define the actual cash flow in the Notional field and the date on which it is to be paid or received in the End Date field.