The following VBA example links frames of paragraph text, placing the first paragraph text inside an ellipse and the second inside a rectangle, and then displaying the index number of each frame inside a container.
Sub Test()
Dim s As Shape
Dim s1 As Shape
Dim s2 As Shape
Dim s3 As Shape
Dim t As Text
Dim f As TextFrame
Dim d As Document
Set d = CreateDocument
Set s = d.ActiveLayer.CreateParagraphText(2, 2, 5, 5, String$(1000, "Z"))
Set s1 = d.ActiveLayer.CreateParagraphText(5, 5, 8, 8)
Set s2 = d.ActiveLayer.CreateEllipse(8, 8, 10, 10)
Set s3 = d.ActiveLayer.CreateRectangle(1, 1, 4, 4)
Set t = s.Text
' Link the frames together.
t.Frame.LinkTo s1
' Place the text inside the shapes.
s2.PlaceTextInside s
s3.PlaceTextInside s1
' Iterate through the frames.
For Each f In t.Frames
If f.IsInsideContainer = True Then
Select Case f.Container.Type
Case 1
MsgBox "Frame " & f.Index & " is inside a rectangle"
Case 2
MsgBox "Frame " & f.Index & " is inside a ellipse"
Case Else
MsgBox "Frame " & f.Index & " is inside a shape"
End Select
End If
Next f
End Sub