menu labels and seo

Hi, I've been trying to find some pointers on this question and couldn't spot any concrete suggestions:

if I have a menu with, say, 4 main subjects and each one has 10 sub-topics, how good/bad is it to have that same menu repeat itself on all my pages?

One variation I've seen is to limit the index page menu to the 4 main subjects, but expand each one on subsequent pages if someone clicks on that main subject: eg, if someone clicks "casino software" on the index page, the next page/s related to casino software would show all the 10 sub-topics (but none of the sub-topics of any of the other main subjects).

Any suggestions?