The menu option you describe doesn't exist in this version of JMP (14.1). See attached photo.
I've reviewed the "fitting linear models" guide for 14.1, and it's clear that this feature isn't available the same way it is in other versions. In order to see box-cox transformations in action, you have to:
Example of Box-Cox Y Transformation
1. Select Help > Sample Data Library and open Reactor.jmp.
2. Select Analyze > Fit Model.
3. Select Y and click Y.
4. Make sure that the Degree box has a 2 in it.
5. Select F, Ct, A, T, and Cn and click Macros > Factorial to Degree.
6. Click Run
That requires columns of values for "F, Ct, A, T, and Cn," versus just the dependent and independent variable values you need in other JMP versions.
Is there a workaround? Is there an add-in for this version?