It depends on the pattern. If there is an edging, you would want to keep that even on both sides, and you'll want to keep the cable pattern even.
Maybe you can compare the stitches on each half and see which side has one less and add one there.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry