Loads and spcs in holes?

Hello, I have to calculate and optimise some parts for a university project. All of those parts are made of sheet metal and are connected via bolts and holes. What would be a propper way to simulate a single part without the bolt? Would you use RBE3s in the hole (the complete hole or just the loaded half in which the bolt is pressing) or are spcs a better option? Another idea of mine was it to use a pressure load in combination with a function, so that the middle would be loaded with the highest force while the outer points wouldn't be loaded at all. I hope you can give me some ideas and sorry for my bad english.