Hi @Alice Winston and welcome to the Community!
I am not really sure if I understand the scope of your question. But when I try to give you some guidance:
Confluence and Jira serve different goals: Jira is where the actual work is tracked, while Confluence is where your documentation / collaboration lives. Depending on the lifecycle stage, you will be working more in one tool than the other or vice versa. When you are documenting requirements, taking decisions or writing meeting notes, Confluence is your best friend. When you start creating stories, planning sprints and tracking progress, Jira will be more prominent.
In terms of work breakdown, standard Jira Software has a 3 level issue hierarchy, consisting of:
Epics >> Stories (tasks, bugs, ...) >> Sub-tasks
If you want to add levels above epics, you either need a Premium plan where Advanced Roadmaps allows you to extend the hierarchy above the Epics. Or on a standard plan, you could use the built-in issue linking feature to define relations. But you would also need a marketplace app to visualise that hierarchy in order to really make it work. Each option comes with a cost, which you would need to balance out with the features you actually need for your specific way of working.
Hope this helps!
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