Unfortunately nested spaces is still one of the oldest and most requested features that has not yet been implemented. There's a discussion asking for requirements at http://confluence.atlassian.com/display/DISC/Nested+Spaces and the feature request is being tracked at https://jira.atlassian.com/browse/CONF-1095
So there's nothing natively in Confluence that supports this, but you might want to have a look at the Meta Data plugin - https://plugins.atlassian.com/plugin/details/5295 - as this allows you to define hiearchical spaces using meta-data.
Hope that's of some help?
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