Sets or returns a Long that represents the ending character position of a selection or text range. Read/write.
expression.End
expression Required. An expression that returns a TextRange object.
This example starts the selection on the 50th character of the current text box shape and ends on the 150th character, then bolds the text.
Sub test2()
With Selection.TextRange
.Start = 50
.End = 150
.Font.Bold = msoTrue
End With
End Sub