Can I make simple collision manually?

I made a stairs static mesh by brush, and used complex collision as simple collision. It works fine but when my character go up the stairs, the camera shakes because of step-up.

So I want to make simple collision as a ramp, but static mesh editor’s auto generation doesn’t work what I intended. Can I generate simple collision manually?

Go to Collision and add what you need.

239564-cap1.png

then go and edit it in the scene below as needed.