Believe it or not, I will soon be tasked with providing an update to a VB6 project. I asked them if they want it to be migrated to VB.NET or C#.
They said no. Since they sign my checks, I say yes boss.
Per the OPs question, you can do something to mimic what you ask for.
You can add a tab space to indent the text box. ASCII tab chr(9) and choose an character to represent a bullet. The example below uses an asterisk, just make sure the symbol you chose is a font that is readily available on most PCs.
Assure that the textbox is set to multiline.
Private Sub cmdList_Click()
Text1.Text = "This line is not indented." & vbCr & vbLf
For i = 0 To 255
Text1.Text = Text1.Text & Chr(9) & Chr(42) & " Line " & i & vbCr & vbLf
Next
End Sub