OffsetAlongLine Property (CIMMarkerPlacementAlongLine)
Gets or sets where the pattern should begin relative to the starting point of the geometry. The entire pattern is shifted along the line for the specified distance. Negative numbers shift to the left and positive numbers shift to the right. This is only applied if the Endings property is set to No Constraint or Custom.
Target Platforms: Windows 11, Windows 10
ArcGIS Pro version: 3.0 or higher.