ComboBox selects an option and window changes - advice

Hey all, I'm working on a dive planning program so the user can convert and calculate items that he needs. I currently have the formulas on one page, but I wanted to develop a more... elegant solution. I've attached an image of what I would like to happen, but in summary, a combo box would have the list of formulas collected from the program when it loads. Once selected, a formula would show up to the right of the combo box. Then the user can follow any required instructions. If the user changes the combo box, then the formula changes. However, I'm completely stumped on how to do this. Is there a way to do it, like show it in a frame or something? I'm fairly new to C# so any advice would be helpful 🙂