Hello Padmé,
Welcome in the Community !
You can perhaps create a first time the factors table manually in the Custom Design platform, and then on the red triangle next to Custom Design, click on "Save Factors". This will create a JMP datatable with the names, levels and roles of your factors, ready to be used next time (if you want to try several designs with the same factors for example). The factors table look like this (see screenshot table_factors), and as you can see, the black asterisks on the left panel next to each column names provide factors properties information : Design Role (Continuous), Factor Changes (Easy) in this case.
You can also create in advance the JMP datatable with the factors and their properties you want to use (this way, in the Custom Design platform, you only have to click on the red triangle and then "Load Factors", and based on this factors table everything will be filled), but you will have to know exactly what are the properties required for each factors to have the correct factors properties formatting for the Custom Design platform.
Other members had a similar question, so you may find more informations here :
Is it possible to load factor or output response setting from a configuration fi... - JMP User Commu...
Solved: Load Factors table into DOE using JSL - JMP User Community
I hope this first answer will help you,
Victor GUILLER
L'Oréal Data & Analytics
"It is not unusual for a well-designed experiment to analyze itself" (Box, Hunter and Hunter)