Here’s a simple example of how you can use VBA in Autodesk Inventor to interact with Excel. This example will demonstrate how to read data from an Excel file and use it to create or modify parts in Autodesk Inventor.

### Scenario:
- You have an Excel file with dimensions for a part.
- You want to create a simple part in Inventor based on these dimensions.

### Step 1: Prepare the Excel File

Create an Excel file with the following structure:
- **A1:** `Length`
- **B1:** `Width`
- **C1:** `Height`
- **A2, B2, C2:** The respective values (e.g., `100`, `50`, `25`).

### Step 2: Write VBA Code in Autodesk Inventor

1. **Open Autodesk Inventor** and go to the **VBA Editor** (`Alt + F11`).
2. Insert a new module (Right-click on `VBAProject (YourDocument) > Insert > Module`).

3. Copy and paste the following VBA code into the module:

```vba
Sub CreatePartFromExcel()
    ' Variables to store Excel data
    Dim xlApp As Object
    Dim xlWorkbook As Object
    Dim xlSheet As Object
    Dim Length As Double
    Dim Width As Double
    Dim Height As Double
    
    ' Open Excel and load the workbook
    Set xlApp = CreateObject("Excel.Application")
    Set xlWorkbook = xlApp.Workbooks.Open("C:PathToYourExcelFile.xlsx")
    Set xlSheet = xlWorkbook.Sheets(1)
    
    ' Read data from Excel
    Length = xlSheet.Cells(2, 1).Value
    Width = xlSheet.Cells(2, 2).Value
    Height = xlSheet.Cells(2, 3).Value
    
    ' Close Excel
    xlWorkbook.Close False
    xlApp.Quit
    Set xlSheet = Nothing
    Set xlWorkbook = Nothing
    Set xlApp = Nothing
    
    ' Variables for Inventor
    Dim oPartDoc As PartDocument
    Dim oCompDef As PartComponentDefinition
    Dim oSketch As PlanarSketch
    Dim oTrans As TransientGeometry
    Dim oProfile As Profile
    Dim oExtrude As ExtrudeFeature
    
    ' Create a new part document
    Set oPartDoc = ThisApplication.Documents.Add(kPartDocumentObject, ThisApplication.FileManager.GetTemplateFile(kPartDocumentObject))
    Set oCompDef = oPartDoc.ComponentDefinition
    Set oTrans = ThisApplication.TransientGeometry
    
    ' Create a new sketch on the XY plane
    Set oSketch = oCompDef.Sketches.Add(oCompDef.WorkPlanes.Item(3))
    
    ' Draw a rectangle with the dimensions from Excel
    Call oSketch.SketchLines.AddAsTwoPointRectangle(oTrans.CreatePoint2d(0, 0), oTrans.CreatePoint2d(Length, Width))
    
    ' Get the profile defined by the rectangle
    Set oProfile = oSketch.Profiles.AddForSolid
    
    ' Extrude the profile to create a 3D part
    Set oExtrude = oCompDef.Features.ExtrudeFeatures.AddByDistanceExtent(oProfile, Height, kJoinOperation)
    
    ' Save the part
    oPartDoc.SaveAs("C:PathToSaveYourPart.ipt", False)
End Sub
```

### Step 3: Run the VBA Macro

1. Go back to the **Inventor Interface**.
2. Run the macro by going to `Tools > Macros > Run Macros`, select `CreatePartFromExcel`, and click `Run`.

### Explanation:

- **Excel Interaction:** The VBA script opens the specified Excel file, reads the dimensions from the second row, and closes Excel.
- **Inventor Interaction:** A new part document is created in Inventor. A rectangle is drawn on the XY plane, which is then extruded to create a 3D solid using the dimensions from Excel.
- **Save the Part:** The part is saved in the specified directory.

### Conclusion

This is a basic example. You can extend this by adding more complex features or using loops to create multiple parts based on different sets of data from Excel.