Setup Subsets
The Setub Subsets tool can be found in the Trim Sheet Panel of Blender's Material Properties.
It is used to quicky add a second metallic material component to Trim Sheet Materials to mirror the look of Subset Decals.
Selection
A material slot in object mode carrying a Trim Sheet Material of a sheet with a subset mask.
Modes
ALT: Use second Trim Sheet Node Group instead of node inputs to setup metallic Subsets.