Creating Combo Group

<RK7Query>
    <RK7CMD CMD="SetRefData" RefName="ModiGroups">
        <Items>
            <Item    GUIDString="{ccfbaa92-5cdb-4c30-9d01-54343d66c830}"
                    ModiGroupType="mgtCombo"
                    MainParentIdent="0"
                    Name="Test combo group"
                    Status="rsActive"/>
        </Items>
    </RK7CMD>
</RK7Query>

Where:

Creating Combo Scheme

<RK7Query>
    <RK7CMD CMD="SetRefData" RefName="ModiSchemes">
        <Items>
            <Item    GUIDString="{e107f57a-97ae-4d94-946b-761335e602ab}"
                    ModiSchemeType="mstCombo"
                    MainParentIdent="0"
                    Name="Test combo scheme"
                    Status="rsActive"/>
        </Items>
    </RK7CMD>
</RK7Query>

ModiSchemeType — a scheme type, a constant.

Creating Combo Element

<RK7Query>
    <RK7CMD CMD="SetRefData" RefName="Modifiers">
        <Items>
            <Item    GUIDString="{3d19a58a-abb3-4e27-8364-3e18b429f3e5}"
                    MainParentIdent="{ccfbaa92-5cdb-4c30-9d01-54343d66c830}"
                    Dish="{D9085A2B-A618-4268-9EC7-E5C8AFEAE442}"
                    Name="Combo dish"
                    PRICETYPES-3="3000"
                    Status="rsActive"/>
        </Items>
    </RK7CMD>
</RK7Query>

Where:

Adding Dishes to Combo Scheme

<RK7Query>
	<RK7CMD CMD="SetRefData" RefName="ModiSchemeDetails">
		<Items>
			<Item 	GUIDString="{642f29bd-4ea5-4680-b5ab-596a2a0a2d83}"
					ModiScheme="1001027"
					ModiGroup="1001026"
					DefaultModifier="1001029"
					DownLimit="1"
					UpLimit="2"
					Flags="[msoUpLimited,msoDownLimited,msoReplaceDefModifier]"
					Status="rsActive"/>
		</Items>
	</RK7CMD>
</RK7Query>

Where:

Adding Combo Dish to Menu

<RK7Query>
	<RK7CMD CMD="SetRefData" RefName="MenuItems">
		<Items>
			<Item 	GUIDString="{efbcd72c-a6ef-4c7b-98cd-cd7ae541a717}"
					MainParentIdent="1000974"
					code="1025"
					Name="Комбо по XML"
					SaleObjectType="sotComboMenuItem"
					ComboScheme="1001027"										
					Status="rsActive"/>
		</Items>
	</RK7CMD>
</RK7Query>

Where: