I assume you are referring to the Seven C's of History Timeline. The poster is an additional component you can purchase for you classroom. It is described on page 3 of the introduction under the Components heading. It is not a necessary part of the lessons, but it will be a great benefit to most classrooms.
You can purchase a print poster or a digital download at this link: https://answersingenesis.org/store/product/seven-cs-timeline-poster/
And the Seven C's will be taught in detail in lesson 11.
Please let me know if you have any other questions.
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