increase max numer of overloads a button can take unity code example

Example 1: How to give a QMenuBar button an action?

self.action = QAction(self)
self.action.setText("Action")
self.menubar.addAction(self.action)
self.action.triggered.connect(self.function)

Example 2: how do i limit the amount of prefabs in unity using c# script

CancelInvoke("Spawn");