I thought something as powerful as Excel would accept using four spaces as delimiter. Apparently I was wrong.
In that case you need to do a little pre-processing: replace 4 spaces with a star:
The result looks something like this:
DataStruct
* Must have (Core)
* * Table/grid view
* * Supported types
* * * Primitive
* * * * Number
* * * * Boolean
* * * * String
* * * Advanced
* * * * Link to other object
* * * * Link to many other objects
* * * Enforce type
* * Template engine
* * * Design syntax
* * * Parser (parse template to internal)
* * * Renderer (fills in data)
* Must have (Civ)
* * Types
* * * Civ
* * * Unit
* * * Building
* * * Tech
* * * Social policy
* * * Terrain
* * * Resources
* * Civ theme
Then import this to Excel by setting delimiter to *
.