I should be so usefull to have something like that :

<kendo-excelexport fileName="Reporting.xlsx" #excelexport>

  <kendo-excelexport-sheet  sheetName="Products">

    <kendo-excelexport-grid [data]="products">

        <kendo-excelexport-column field="ProductID" title="Product ID"></kendo-excelexport-column>

        <kendo-excelexport-column field="ProductName" title="Product Name"></kendo-excelexport-column>

    </kendo-excelexport-grid>

  </kendo-excelexport-sheet>

<kendo-excelexport-sheet  sheetName="Stock">

    <kendo-excelexport-grid [data]="stockFromWarehouseOne">

        <kendo-excelexport-column field="ProductID" title="Product ID"></kendo-excelexport-column>

        <kendo-excelexport-column field="ProductName" title="Product Name"></kendo-excelexport-column>

        <kendo-excelexport-column field="Qt" title="Qt"></kendo-excelexport-column>

    </kendo-excelexport-grid>

    <kendo-excelexport-row></kendo-excelexport-row>


    <kendo-excelexport-grid [data]="stockFromWarehouseTwo">

        <kendo-excelexport-column field="ProductID" title="Product ID"></kendo-excelexport-column>

        <kendo-excelexport-column field="ProductName" title="Product Name"></kendo-excelexport-column>

        <kendo-excelexport-column field="Qt" title="Qt"></kendo-excelexport-column>

    </kendo-excelexport-grid>

  </kendo-excelexport-sheet>

</kendo-excelexport>

One export, two sheets, on first sheet we have one grid, on second sheet we have two grids splitted by a blank row...