Bend lines are created automatically and can't be deleted, but can be hidden.
This sample doesn't cover work with bend notes, because it depends on the reason (why and when they are created).
But you can start your research from this short snippet. This code hides all bend lines in drawing view which belongs to bends with inner radius greater then 10 mm (1 cm)
'This assumes the drawing is active and the first view on first sheet
'contains flat pattern
Dim drawing As DrawingDocument = ThisDoc.Document
Dim flatPatternView As DrawingView = drawing.Sheets(1).DrawingViews(1)
Dim part As PartDocument = flatPatternView.ReferencedDocumentDescriptor.ReferencedDocument
Dim sheetMetalDef As SheetMetalComponentDefinition = part.ComponentDefinition
Dim flatPattern As FlatPattern = sheetMetalDef.FlatPattern
For Each flatBendResult As FlatBendResult In flatPattern.FlatBendResults
Dim edge As Edge = flatBendResult.Edge
Dim innerRadius As Double = flatBendResult.InnerRadius
If innerRadius > 1 Then '[cm]
Dim edgeDrawingCurves As DrawingCurvesEnumerator = flatPatternView.DrawingCurves(edge)
For Each edgeDrawingCurve As DrawingCurve In edgeDrawingCurves
For Each segment As DrawingCurveSegment In edgeDrawingCurve.Segments
'TODO: Do something useful with drawing curve segment which belongs to bend grater then 1 [cm]
segment.Visible = False
Next
Next
End If
Next