E1: Kanban Dual Sourcing

Hi,

Could you provide a step by step setup to test dual sourcing using Kanban. I want to be able to define vendor split % however, I see this is a calculation method indicator in the master. At what point in Kanban does this split get applied? I set a 80-20 split and it does not get applied at creation of OP. An example and steps will be helpful to test scenarios.

Note: I've checked the implementation guide and I need more guidance on the steps.

Thanks,

Jay