Be warned… this bios system seems to be a “special” AMI V Aptio for Lenovo, current leaked AMI tools may not work as expected.
Alternative: [TOOL] UEFI Editor - BIOS/UEFI Modding / BIOS Modding Guides and Problems - Win-Raid Forum (level1techs.com)
The reference pointed in the X79/X99 is the same principle
Q: What is IIO?
A: Integrated Input/Output controllers manage traffic between PCI Express and CPU domains.
You CANT add it to the bios its there OR not.