When placing a word document into indesign using the map styles feature, inDesign will only automatically map to existing styles in the document if they are in the root folder of the styles pane. If styles are in subfolders new styles of the same name are created in the root and I manually have to remove them and relink to the existing ones.

This is a nightmare when you have a lot of styles to map, as you end up with a messy styles pallette - i'd love to create subfolders for list / headings / footer styles etc :)