Creating custom drop down for reason for rejection or candidate declining job offer

Summary

Want to create custom drop down list for when rejecting a candidate or when candidate declines offer and states reason for declining

Content

We have a list of reasons we need to capture internally when we reject a candidate. How can you create a phase that will be Rejected and in the State, listing the custom drop down values for reason for rejection. If this is not an option, is there another alternative?

Version

20B