Note: The difference below starts after "Instead," and goes through to the end.
mchan ’grel refers to the custom of someone writing small notes in a text written by someone else, and then writing a small chain of dots (mchan btags) to connect any given note to the point in the original text to which it applies. If the book that you are typing has མཆན་འགྲེལ་, you should enter it using the following method. The result will not look like མཆན་འགྲེལ་ does in the printed copy of your book. However, when the computer file is used to create a pecha, the མཆན་འགྲེལ་ that you have entered can be automatically formatted to appear in the traditional way.
To type མཆན་འགྲེལ་, you will not enter in the small dots (མཆན་རྟགས་) that lead from the place of insertion to the note. Instead,
The result will have a footnote number in the text, and something like this in the footnote itself: མཆན་འགྲེལ་ཟེར་ཡ་འདི་མཆན་བུའི་ཡི་གེ་རེད།
An alternative method is to first enter in the text of the note at the appropriate location as described above. Then, highlight it and press Ctrl+F1. This will turn the highlighted text into the note style.
Note: The words ཡང་བྱུང་ in the context of a མཆན་འགྲེལ་ are the rough Tibetan equivalent of "variant reading."