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This can probably best be achieved by changing Styles at the correct locations within the song.

Start by choosing the 6/8 style for your song.
Select the bar that the chorus starts, press function key <F5> (or right-click and select Bar Settings), and select a 4/4 style from the .STY button option.

Repeat when you need to revert to 6/8 if it's further along in the song.

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