How to Increment the Sub Headings in word using VSTO.

Question

I want like this sub heading Increment.

 

1. Chapter One

1.1 Chapter One Section One

1.1.1 Chapter One Section One Subsection One

1.1.2 Chapter One Section One Subsection Two

2. Chapter Two

2.1 Chapter Two Section 1

3. Chapter Three

3.1 Chapter Three Section One

 

But I am getting like

 

1. Chapter One

1.1 Chapter One Section One

1.1.1 Chapter One Section One Subsection One

1.1.2 Chapter One Section One Subsection Two

2. Chapter Two

1.2 Chapter Two Section 1

3. Chapter Three

1.3 Chapter Three Section One

 

Here is my code.

 

 

Microsoft.Office.Interop.Word.Application app = Globals.ThisAddIn.Application;

Microsoft.Office.Interop.Word.Document doc1 = app.ActiveDocument;

string sHeadingNm = doc1.Styles[WdBuiltinStyle.wdStyleHeading1].NameLocal;

Microsoft.Office.Interop.Word.Style style = null;

ListTemplate template = null;

doc1.UpdateStyles();

app.ListGalleries[WdListGalleryType.wdOutlineNumberGallery].Reset(2);

template = app.ListGalleries[WdListGalleryType.wdOutlineNumberGallery].ListTemplates[2];

Microsoft.Office.Interop.Word.ListLevel level = template.ListLevels[1];

if (level.NumberStyle == WdListNumberStyle.wdListNumberStyleBullet)

{

level.NumberStyle = WdListNumberStyle.wdListNumberStyleNone;

}

level.NumberFormat = sPrefix + "%1.";

level.TrailingCharacter = WdTrailingCharacter.wdTrailingTab;

level.NumberStyle = WdListNumberStyle.wdListNumberStyleArabic;

level.NumberPosition = app.InchesToPoints(0f);

level.Alignment = WdListLevelAlignment.wdListLevelAlignLeft;

level.TextPosition = app.InchesToPoints((float)nHeadIndent);

level.TabPosition = app.InchesToPoints((float)nHeadIndent);

level.ResetOnHigher = 0;

level.StartAt = int.Parse(sHead1No);

//level.LinkedStyle = sHeadingNm + "1";

//Microsoft.Office.Interop.Word.Style style = doc1.Styles["Heading " + 1];

style = doc1.Styles["Heading " + 1];

style.LinkToListTemplate(template, 1);

 

This code I am applicale for Heading 1 to 5.

 

Please anyone help me. Send me the code back.