Split Sourcing to procure two related parts 50% of PartA and 50% PartB

Summary:

We have a requirement to buy two functionally related parts 50% PartA and 50% PartB when there is demand.

If we make a relationship between two parts PartA and PartB, and can Supply plan (Unconstrained) support to buy 50% of PartA and 50% of PartB when there is demand on any one of these two parts?

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