Help in setting up multiple nested groups

I just can’t figure it out.. I have spent many hours trying, so if possible I would like to get a little direction here for my specific need.

Here are the hierarchical groups I want to create along with their abilities.

Top level: Committee (Can access this level, and all content for each group levels below, and can edit and upload content to any of those pages)
Second tier level: Cubs Leaders (Can access this level, and all content for each group levels below, and can edit and upload content to any of those pages)
Third tier level: Cubs Parents (Can access this level, and all content for each group levels below, but can only read content, not edit)
Fourth tier level: Cubs (Can access this level, and all content for each group levels below, but can only read content, not edit)
Fifth tier level: Registered User (Can access this level, but can only read content, not edit)

Repeat the same hierarchical set of groups above, but replace the word ‘Cubs’ with ‘Scouts’ (and repeat again but replace with the word ‘Cubs’ with ‘Venturers’, etc). So that Committee group is the head of the tree, and has three groups below it of ‘Cubs Leader’, ‘Scouts Leader’, and ‘Venturers Leader’.. each of which have their own hierarchical groups below them called ‘parents’ ‘cubs or scouts or venturers’ and ‘registered user’.

Can you just tell me how to create the first stream of nested group levels, and I’ll figure out the rest. For instance, if you can tell me the steps on how to set up my specific examples of the ‘Committee group’, ‘Cubs Leader group’, Cubs Parent group’, and maybe ‘registered user group’.. then I should be able to complete the other streams.

Thanks for your help.