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{{Note | The steps below describe what needs to be done in ArcGIS. The sub-theme 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 Victim by Agriculture blockages Gender will be used.
<ol>
[[Image:Customise Subtheme3.png|300px|center]]
<div align="center">
'' IMSMA layer Land Victim User Defined Theme 1''
</div>
<li>For each item there is one User Defined Theme in the IMSMA.mxd. </li>
<li>Copy the whole group by right-click and chose Copy. </li>
<li>Then select the highest level for the item, in this case LandsVictim. </li>
<li>Right-click and chose Paste Layer(s). </li>
[[Image:Customise Subtheme4.png|300px|center]]
<li>Rename it and edit the symbols. </li>
<li>Use the same syntax as another layer for this item e.g. by Type. </li>
<li>Apply the same change to the all the other layers for Agricultural Fields BlockedGender.
If you need guidance on how to work with symbology and the syntax for Values, see
[[Change existing symbol in IMSMA.mxd]] and
