The Tree View control is a great way to represent hierarchical data for navigation and other purposes.
The Access MVP site has a link to Access Junkie pages for working with the Tree View control. Note: there are many 32 bit versions of Tree View implementations so be aware of what version of Access you are developing in/for. There is a 64 bit version of the MSCOMCTL.OCX which contains the TreeView in July 2017 updates of Office 2016 (Office365 subscriptions). There are also several third party Tree View controls available as well as a nifty MS Forms and VBA-only approach to building a Tree View.