How can I finish the hole in object?

I created a vase shape. And inside it, I added 4 shapes that I want to create the 4 holes with. How can I continue from here, that their ends to cut down the wall, for seeing through the vase? You will understand when opening the file. Thank you for help:) hole.3dm (544.3 KB)
Please let me know the way you achieve it.

You have to select your 4 objects. Use DupBorder to create all border curves
After this select your outer curves and use trim to cut the outer surface
Then Select the inner curves and trim the inner surface.

Example Hole.3dm (738.0 KB)