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You can convert a SmartArt shape into a group shape using the Shape.getResultOfSmartArt() method. It will enable you to handle a SmartArt shape like a group shape. Consequently, you will have access to the individual parts or shapes of the group shape.
The following sample code loads the sample Excel file containing a SmartArt shape as shown in this screenshot. It then converts the SmartArt shape into a group shape and prints the value of the Shape.isGroup property. Please see the console output of the sample code given below.

const path = require("path");
const AsposeCells = require("aspose.cells.node");
// Load the sample SmartArt shape - Excel file
const filePath = path.join(__dirname, "data", "sampleSmartArtShape_GetResultOfSmartArt.xlsx");
const workbook = new AsposeCells.Workbook(filePath);
// Access first worksheet
const worksheet = workbook.getWorksheets().get(0);
// Access first shape
const shape = worksheet.getShapes().get(0);
// Determine if shape is SmartArt
console.log("Is Smart Art Shape: " + shape.isSmartArt());
// Determine if shape is group shape
console.log("Is Group Shape: " + shape.isGroup());
// Convert SmartArt shape into group shape
console.log("Is Group Shape: " + shape.getResultOfSmartArt().isGroup());
Is Smart Art Shape: True
Is Group Shape: False
Is Group Shape: True
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