Pasting text with formatting with proper auto numbering

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VB

clipboard

MS-Word

RichTextBox

I have in Microsoft Word 5 lines od text with auto numbering. All lines have it's own formatting like bold, italic, etc.

1. Line 1
2. Line 2
3. Line 3
4. Line 4
5. Line 5

When I copy to clipboard selected lines 2-4 and paste it into TextBox control in VB.NET Windows Form Application I get same text without formating (auto numbers are 2/3/4)

When I copy to clipboard selected lines 2-4 and paste it into RichTextBox control I get same text with formating but auto numbers are counted from 1, so I have 1/2/3 instead of 2/3/4

I need a way to copy-paste text into richtextbox with preserved formating an exact auto numbering but no luck so far.

What I have tried:

comparing letter by letter (textbox and rchtextbox) but with no luck
using Interop.Word to somehow retrive this informatiom but with no luck

I Would prefer to use pure VB soulution without Word Interop