First of all, it is difficult to have a 5-year multiple entry business visa in Saudi Arabia. However, If you are a business man and you would like to visit Saudi Arabia more often, your travel to Saudi Arabia will surely be made easier.
Below are the fundamental procedures (take note that processes might change as of this writing). And if you will not follow the instructions properly, you will face difficulties. Also, it is not easy to acquire a visa in Saudi Arabia and if you have one, then you are blessed.