alternative versions

Sometimes the songwriter will sing his/her song slightly differently from the way it is written in the published score. The differences are tiny, perhaps four notes in four bars out of say 200 notes in 50 bars. Is there a neat way of indicating this. The best I have so far is to show trhe two alternatiuve bars with line 1 iver the first and line 2 over the secod. Is there an authorised way of doing this; I'd like toi be able to tell Muse Score "play it as version 1" or "play it as version 2". At the moment this techniqe works for sections where a passage is sung twice as indicated by the dots but not where it is sung once. I can cheat by adding dots to force a short phrase to be sung twice once in each way.