How to Cut Through Multiple Objects in Illustrator (Divide Everything) 

Learn how to use a single path to divide all of the artwork beneath it in Illustrator. Details below...
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Create a path that will be used to divide the other Illustrator artwork.
Select that path.
Ensure that path sits above the artwork that it is to divide.
Right mouse click - Arrange - Bring to Front
Menu: Object - Path - Divide Objects Below