Advice for efficient menu

I’m using Weaver II on my site. I have 9 main pages, and I think that is enough for the main default MENU which appears beneath the header.

I need to make several more pages. But they will be under the topic of other pages. For example, when people click on “History”, I will have about 6 pages for History. What is the best way of doing this? I do not want each 6 History pages to appear in the regular menu for all the other pages because it will get too crowded. I do want each of those 6 pages to be separate pages though, with their own title.

I am very new, so simple step instructions really help me! Thanks very much.