After discovering "SelectedLayers" it was smooth sailing from there. Very simple.
Dim pl
Dim doc
Dim layer
Dim layers
Set pl = CreateObject("PhotoLine.Application")
Set doc = pl.ActiveDocument
pl.Visible = True
If Not doc Is Nothing Then
Set layers = doc.SelectedLayers
If (Not layers Is Nothing) Then
For Each layer In layers
layer.DoOperation "Scale", "Mode", 5, "ValueX", 300, "ValueY", 300, "Interpolation", 6,"ShowDialog",true
Next
End If
End If
