{{Note | The steps below describe what needs to be done in ArcGIS. The sub-theme also needs also to be defined in {{IMSMANG}}. These steps are described in [[Customise Sub-Themes]].}}
If you would like to add a Sub-Theme, you need to use ArcGIS software to update IMSMA.mxd which is located in ''C:\IMSMAng\server\gis\maps'' folder. As example Land by Agriculture blockages will be used.