Flatness over length

Flatness over length

I have a plane that's 800mm long with a very tight flatness tolerance allowed, but the tolerance is only over 100mm. The callout is similar to this

https://redlux.net/wp-content/uploads/2021/11/word-image-35.png

Is there a way to report on this through CMM manager? I can only seem to find flatness over the entire plane.