To use this function you should first familiarize yourself with the Clickbank documentation for their Pitch Plus functionality:
Inside OptimizePress, when you create an order button using our "Membership Order Button" element, you can add the special variables you need to setup the order buttons as pitch plus order buttons:
cbfid="" Optional ClickBank® PitchPlus Upsell Flow ID, which MUST correlate with a PitchPlus Upsell Flow you've configured at ClickBank.com. [?]
cbur="" Optional ClickBank® PitchPlus Upsell Flow action (a accept or d decline), which MUST correlate with instructions provided by ClickBank.com for PitchPlus Upsell Flows. [?]
cbf="auto" Optional ClickBank® PitchPlus Upsell Flow session ID, which MUST correlate with instructions provided by ClickBank.com for PitchPlus Upsell Flows. optimizeMember® Pro handles this automatically when you define cbur="a" (or cbur="d"); and set this to cbf="auto"(recommended).
This is an advanced feature so we recommend ensuring that you are familiar with upsells and Clickbank functionality before attempting to use this function