The end result of Diagram B should be a Cell that you name appropriately so you can easily identify it and select the option to make it Linkable. Save Diagram B.
In the Diagram A the end node should be a Cell. Then create a Link Node and select the cell from Digram B as the source. Then create a Prioritize node point Diagram B's cell to it first and then point Diagram A's cell to it next. Open the Priority node and check that Diagram B is in fact at the top of the priority list (matches will get pulled out) and that Diagram A's selection is second (post-suppression). Then save and execute.
That's one way to go about it.