Pressure drop (and system curves) for diverging branches

Last time I looked at fluid flow and pressure drop in parallel branches that split from a common point and then converge again. But what happens if the destinations of the branches are different so they never meet again? (*sniff sniff*) How do you generate a system curve for diverging branches?

00:00 Converging and diverging branches
01:14 Terminating each branch
04:50 Polynomial fitting & negative values
08:02 Combined system curve

Link to sheet with the example I work through:
https://docs.google.com/spreadsheets/...

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