Can we add an Attribute of a Sub type of WTDocument which is an optional and single valued string attribute which can have only one amongst the suggested values and no other values should be permissible.

Hi All,

Can we add an Attribute of a Sub type of WTDocument which is an optional and single valued string attribute which can have only one amongst the suggested values and no other values should be permissible.

Like the suggested values are like say

ABC

DEF

So If yes kindly tell me how we can add it ?

Thanks and Regards,

Aditya Achanta