ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Core.CIM Namespace / CIMLevelLayerProperties Class / SubLayerID Property

SubLayerID Property (CIMLevelLayerProperties)
Gets or sets the sublayer ID when the Level layer is a sublayer within a dynamic map service layer.
Syntax
public int SubLayerID {get; set;}
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 2.9 or higher.
See Also