In the Model tab, there will be a subtab titled Automine located on the left side of the interface. In this space, you can investigate model availability, and also, exclude original variables and their new coefficients. All you need to do is right-click on the variable and choose Exclude Variables and their transforms available for modeling. You can also select multiple variables at a time, and exclude them simultaneously by using the same method. If you ever want to build a model with a very specific set of variables included, you can use the “Build” option instead of the “Build Automatically” option.