<Module>
<Name value="My Module"/>
<Id value="MyModule"/>
<Version value="v1.0.0"/>
<SingleplayerModule value="true"/>
<MultiplayerModule value="false"/>
<DependedModules>
<DependedModule Id="Native"/>
<DependedModule Id="SandBoxCore"/>
<DependedModule Id="Sandbox"/>
<DependedModule Id="CustomBattle"/>
<DependedModule Id="StoryMode" />
</DependedModules>
<SubModules>
<!-- The following SubModule element is optional. You can remove this portion if your mod does not have a DLL associated with it. -->
<SubModule>
<Name value="MySubModule"/>
<!-- Path to the DLL File, if your Mod is called MyModule then it should be -->
<DLLName value="ExampleMod.dll"/>
<SubModuleClassType value="ExampleMod.MySubModule"/>
<Tags>
<Tag key="DedicatedServerType" value="none" />
<Tag key="IsNoRenderModeElement" value="false" />
</Tags>
</SubModule>
</SubModules>
<Xmls>
<XmlNode>
<XmlName type="1" id="Items" path="customitems"/>
</XmlNode>
<XmlNode>
<XmlName type="1" id="SPCultures" path="customcultures"/>
</XmlNode>
<XmlNode>
<XmlName type="1" id="NPCCharacters" path="customcharacters"/>
</XmlNode>
</Xmls>
</Module>
It is called SubModule and is an xml file, inside a modules folder called My Module
It is the copy paste from the documentation available