How to insert a section break into an already written section.

The answer to this query may be in a tutorial or video or the manual, but I haven’t been able to find it. I want to divide a section already written (with images) into two sections. How do I do that?
Thanks,
drbob

Documents -> Split, with the cursor at the desired split point.

One of the most useful and underutilized commands in Scrivener, in my opinion.

Katherine