To insert it manually, use Ctrl+Shift+Space


Selection.HomeKey Unit:=wdStory
Selection.Find.ClearFormatting
Selection.Find.Style = ActiveDocument.Styles("Normal")
Selection.Find.Replacement.ClearFormatting
With Selection.Find
.Text = " "
.Replacement.Text = "^s"
.Forward = True
.Wrap = wdFindContinue
.Format = True
End With
Selection.Find.Execute Replace:=wdReplaceAll