Create opening on multiple faces

[tase]

i have a problem, im trying to create a window on a side of this object but it has multiple faces and it would push/pull it properly.
Does anyone know how to do this?
I'm making a bird house for class btw

[Gaieus]

Hi Taylor,

When you "poked" that shape through the other one, select everything, right click on the selection, and from the context menu, go to Intersect > ...with model (or selected). Now the two shapes will form edges where they meet and you can start carefully deleting unwanted geometry.