Copying INF Files
It is sometimes necessary to stage other driver packages into the Driver Store of the system as part of staging a primary driver package. For example, the driver package for the root of a multifunction device might stage the driver packages for the device's individual functions so that Windows has these driver packages available as it installs the device's functions.
To stage other driver packages into the Driver Store of the system, an INF file can use the INF CopyINF directive.
Installation software must never copy INF files directly into a system's %SystemRoot%/inf directory or Driver Store directory.