ListFormatListLevelNumber Property

public int ListLevelNumber { get; set; }

Public Property ListLevelNumber As Integer
	Get
	Set

using SautinSoft.Document;

namespace Sample
{
    class Sample
    {

        static void Main(string[] args)
        {
            // Get your free 100-day key here:   
            // https://sautinsoft.com/start-for-free/

            MultilevelLists();
        }

        /// <summary>
        /// How to create multilevel ordered and unordered lists.
        /// </summary>
        /// <remarks>
        /// Details: https://sautinsoft.com/products/document/help/net/developer-guide/create-multilevel-list-in-docx-document-net-csharp-vb.php
        /// </remarks>        
        public static void MultilevelLists()
        {
            string documentPath = @"MultilvelLists.docx";

            // Let's create a new document.
            DocumentCore dc = new DocumentCore();

            // Add a new section.
            Section s = new Section(dc);
            dc.Sections.Add(s);

            string[] myCollection = new string[] { "One", "Two", "Three", "Four", "Five" };

            // Create list style.
            ListStyle ls = new ListStyle("MyListDot", ListTemplateType.NumberWithDot);
            dc.Styles.Add(ls);

            // Add the collection of paragraphs marked as ordered list.
            int level = 0;
            foreach (string listText in myCollection)
            {
                Paragraph p = new Paragraph(dc);
                dc.Sections[0].Blocks.Add(p);

                p.Content.End.Insert(listText, new CharacterFormat() { Size = 14.0, FontColor = Color.Black });
                p.ListFormat.Style = ls;
                p.ListFormat.ListLevelNumber = level++;
                p.ParagraphFormat.SpaceAfter = 0;
            }

            // Add the collection of paragraphs marked as unordered list (bullets).
            // Create list style.
            ListStyle ls1 = new ListStyle("MyListBullet", ListTemplateType.Bullet);
            dc.Styles.Add(ls1);

            level = 0;
            foreach (string listText in myCollection)
            {
                Paragraph p = new Paragraph(dc);
                dc.Sections[0].Blocks.Add(p);

                p.Content.End.Insert(listText, new CharacterFormat() { Size = 14.0, FontColor = Color.Black });
                p.ListFormat.Style = ls1;
                p.ListFormat.ListLevelNumber = level++;
                p.ParagraphFormat.SpaceAfter = 0;
            }

            // Save our document into DOCX file.
            dc.Save(documentPath, new DocxSaveOptions());

            // Open the result for demonstration purposes.
            System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(documentPath) { UseShellExecute = true });
        }
    }
}

Imports System
Imports System.IO
Imports SautinSoft.Document

Module Sample
    Sub Main()
        MultilevelLists()
    End Sub
    ''' Get your free 100-day key here:   
    ''' https://sautinsoft.com/start-for-free/
    ''' <summary>
    ''' How to create multilevel ordered and unordered lists.
    ''' </summary>
    ''' <remarks>
    ''' Details: https://sautinsoft.com/products/document/help/net/developer-guide/create-multilevel-list-in-docx-document-net-csharp-vb.php
    ''' </remarks>
    Sub MultilevelLists()
        Dim documentPath As String = "MultilvelLists.docx"

        ' Let's create a new document.
        Dim dc As New DocumentCore()

        ' Add a new section.
        Dim s As New Section(dc)
        dc.Sections.Add(s)

        Dim myCollection() As String = {"One", "Two", "Three", "Four", "Five"}

        ' Create list style.
        Dim ls As New ListStyle("MyListDot", ListTemplateType.NumberWithDot)
        dc.Styles.Add(ls)

        ' Add the collection of paragraphs marked as ordered list.
        Dim level As Integer = 0
        For Each listText As String In myCollection
            Dim p As New Paragraph(dc)
            dc.Sections(0).Blocks.Add(p)

            p.Content.End.Insert(listText, New CharacterFormat() With {
                .Size = 14.0,
                .FontColor = Color.Black
            })
            p.ListFormat.Style = ls
            p.ListFormat.ListLevelNumber = level
            level += 1
            p.ParagraphFormat.SpaceAfter = 0
        Next listText

        ' Add the collection of paragraphs marked as unordered list (bullets).
        ' Create list style.
        Dim ls1 As New ListStyle("MyListBullet", ListTemplateType.Bullet)
        dc.Styles.Add(ls1)

        level = 0
        For Each listText As String In myCollection
            Dim p As New Paragraph(dc)
            dc.Sections(0).Blocks.Add(p)

            p.Content.End.Insert(listText, New CharacterFormat() With {
                .Size = 14.0,
                .FontColor = Color.Black
            })
            p.ListFormat.Style = ls1
            p.ListFormat.ListLevelNumber = level
            level += 1
            p.ParagraphFormat.SpaceAfter = 0
        Next listText

        ' Save our document into DOCX file.
        dc.Save(documentPath, New DocxSaveOptions())

        ' Open the result for demonstration purposes.
        System.Diagnostics.Process.Start(New System.Diagnostics.ProcessStartInfo(documentPath) With {.UseShellExecute = True})
    End Sub

End Module