How to Auto-Generate Item Description / Name using EFFs

Summary:

There is a customer ask, where he mentions that he has some custom Item Master Name. for e.g, A-B*C/D.

Saw a post in the communities that this can be acheived using EFFs, Hence created 4 EFFs and mapped it to a attribute group and item class. I am able to see the EFF Page where I can add the values but unable to generate a Item Description/ Name from it. I tried using Item Rule Sets and create couple of Validation and Assignments Rule but still no use. Requesting the community for suggestion / solutions for this issue