The fastest way to measure an opening for casing

Trim & Molding
Doors
Cut Lists

Casing is three pieces off two dimensions, and taking them out of order is how a leg ends up short with the miter already cut. Saving jamb, head and return in sequence on the T1M Utility sends the whole opening to the saw as one list. The trim carpenter cuts a set rather than walking back for the number nobody wrote down.

Why casing sets get mixed up

Three pieces off two dimensions
Taken out of order, a leg ends up short
Jamb, head and return saved in sequence
The opening reaches the saw as one list
No walking back for a missing number

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Casing an opening means three pieces that all depend on the same two dimensions, and getting them in the wrong order is how you end up short. Running the jamb height, then the head, then the return at the floor, saving each as you go, means the whole set goes to the saw as one list rather than three trips.