I think I got it. It may be crude but it works. I think within a week or two I can be an MPV.
Code:
Sub Highlight_WordN()
Dim sFindText As String
'Start from the top of the document
Selection.HomeKey wdStory
sFindText = "Procedure Step:"
Selection.Find.Execute sFindText
Do Until Selection.Find.Found = False
Selection.EndKey Unit:=wdLine, Extend:=wdExtend
Selection.Range.HighlightColorIndex = wdYellow
Selection.MoveRight
Selection.Find.Execute
Loop
End Sub