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not defined sketch - Any chance someone can run me through step y step how to fix this? Thank you

Answers
There is nothing to ty back to the origin and fix all in place.
If you start the sketch something like this it will be held in place to the origin.
Although glen_dewsbury doesn't mention this, he has made use of constraints (instead of dimensions) to simplify the sketch. Take the time to explore "constraints" - this will take you to the next level in your work. Good luck