A more thorough explanation:

Definition: Heretofore is an adverb that means "up to now" or "before this time". Example: The company had heretofore been successful, but now they are facing financial difficulties. Explanation: This example shows that up until now, the company had been doing well, but something has changed and they are now struggling. The use of "heretofore" emphasizes the contrast between the past success and the current difficulties.