Every four units, I have the students start a new unit cover. The student fills in the 9 weeks, the unit titles, and then copies the word wall for each unit onto the large blank area for each unit. This creates "dividers" in their interactive notebooks to easily find units, key terms, and general information for each 9 week period. This also makes it easy for me to tell students what is needed for study time on test. Print at 78% to fit nicely on the small composition notebook page.
I also have one for six weeks if your school functions on six week grading periods.