IBM Cognos User Manual page 330

Use the dimension map to define, check, or update the structure of your model.
For example, you can
v add, move, or remove entire dimensions or the layered levels within them
v create or remove alternate drill-down paths to support multidimensional
v create a time dimension that contains the relevant divisions in your calendar or
v open the property sheet for a selected dimension or level to set its available
v add levels manually so that you can more accurately allocate key performance
v lock levels or entire dimensions so that new data does not disrupt your primary
v show category counts for each level in every dimension
v show the scope for selected data sources or measures
v establish associations between levels and measures in a multiple data source
The following dimension map icons are used to indicate the type of dimension or
level.
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IBM Cognos Transformer Version 10.1.1: User Guide
analysis
fiscal year
options
measures
structure
model