Stat > DOE > Modify Design
Allows you to change the factors names and assign values for factor settings for a design you have already created. Modify design recalls the table you used for setting names and levels of the factors. You can also change factor names in the Data window.
The dialog box that appears depends on the type of design you are working with. Choose a design type below:
Two-level factorial and Plackett-Burman designs
General full factorial designs
Taguchi design (static design)
Taguchi design (dynamic design)