PMI is product manufacturing information, such as 3D annotations, GD&T (geometric dimensions and tolerances), and other manufacturing information. It is added directly to a 3D CAD model. For a full overview, including how to create, view, and import PMI, see Product manufacturing information (PMI).
When a design's PMI includes tolerance information, Fusion can set the correct tolerances automatically. This applies when you create manual inspections and Probe WCS and Probe Geometry operations. It helps automate programming and reduces the risk of entering wrong values.