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In the case when LineNumber is automatically set when s_UseTool::AddAsUserDrawnDrawing is set to 1 or a nonzero number, the automatically assigned LineNumber may be a negative number or it may be a positive number. When adding Chart Drawings during the calling of the study function, it will continuously decrement to a more negative number, or decrement to a less positive number, depending whether it is negative or positive, without any skips of numbers. Therefore, when adding a range of drawings you can remember the beginning LineNumber and the ending LineNumber to later be able to reference that range of drawings for modification or deletion. Remember these values in Persistent Variables.