If you collect enough data during a MultiVariateTest, but there are more combinations which are performing well. You would like to go furthur with the successful combinations. So I understand the point that you should pause the existing MVT and duplicate it, because all visitors will begin with a clean sheet instead of seeing the old variations.
But now you can only pause a whole variation instead of pause a specific combination in the duplicate.
You need to make a whole new A/B test with the successful combinations to "continue" the test. It would be great if it's possible to pause just a specific combination.