I am trying to make a data calculation sheet for a boat cell we generally use 2 margins to calculate price but I want to have a custom margins field and check box. As I have it right now check box 1 set is true, checkbox 2 is false and these will generate the margin for 17% or 20% respectively. I want to insert a 3rd check box that is a "custom amount" so when clicked over rides the true/ false from the first two and generates a formula pulling the custom percentage from another cell. Is this possible? first screenshot is the layout the second is how it is set up with the IF formula now.
Ideally only one checkbox should be selected and in this case why didn't you insert the 3 Option Buttons linked to the cell A6 so that user can select only on option i.e. either 17% or 20% or Custom. And in this case the linked cell would return either 1 or 2 or 3 depending upon whether you select first or second or third option button and then you may tweak your formula like below...
Where B5 would be the cell with custom %. So if user selects the third option Custom, the formula will use the % entered in the cell B5. You may change it to any other cell as per your setup.