{{Note | The below only describes what needs to be done in {{IMSMANG}}. The sub-theme also needs also to be defined in the imsma.mxd and the map imported again. Contact your GICHD IM focal point for step-by-step instructions.}}
IMSMA allows you to add up to five subcategories, called sub-themes, to a map theme. Sub-themes can be created based on any default fields or custom-defined fields (including subobject CDFs) for that theme. For example, you could modify the ''Activity'' theme to include a sub-theme for the ''Booby Trapped'' field.