{{Note | The steps below describes describe 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. These steps are described in [[How to work with Sub-Themes in IMSMA.mxd]].}}
[[Image:Customise Subtheme0.png|400px|center]]
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IMSMA allows you to add up to five customised themes, called subSub-themes, to each of the IMSMA themes. Sub-themes can be created based on any IMSMA {{IMSMANG}} system fields or customCustom-defined fields Defined Fields (including subobject CDFs) for that theme. For As example, you could modify the ''Activity'' theme to include a sub-theme for the ''Booby Trapped'' fieldLand by Agriculture blockages will be used.
: Each theme contains five blank rows for adding a sub-theme. These are labelled ''UserDefined1'', ''UserDefined2'', ''UserDefined3'', ''UserDefined4'', and ''UserDefined5''.
<li>Select the row of the sub-theme that you want to assign or reassign.</li>
<li>Click the [[File:FieldViewIcon.png]] button.</li>
{{Warning | The sub-theme assignments are '''not''' stored in the IMSMA database. They are stored in the file ''C:\IMSMAng\client\conf\UserPrefs.props''. The file is included in the ''Map Data'' option of backup and restore.}}
<li>Define You have now done the sub-theme definition steps in the imsma.mxd{{IMSMANG}}.</li><li>ReYou now should proceed with the [[How to work with Sub-import the background mapThemes in IMSMA.mxd | definition steps in ArcGIS]].</li>