Hand a visitor to another funnel
The Switch to Funnel node continues a visitor in another funnel's flow, so one upsell chain can serve every funnel.
Your best upsell chain lived in one funnel. Every other funnel that wanted it had to rebuild it, and keep every copy in sync.
The enemy is copying the same upsell chain into every funnel.
The new Switch to Funnel node hands the visitor to another funnel and carries on in that funnel's flow: its upsells, its downsell, its thank-you page. Resume at a page, or at a purchase node so the target funnel's own Product Check picks the upsell. Affiliate and UTM parameters come along. A switch that crosses domains still knows what was bought, and the builder warns you about what crossing domains costs.
Try it: after a Has Tag check, add a Switch to Funnel node pointing at your main upsell funnel, and run a test purchase through it.