Black Hamburg Vine Cutting Back as Too Big

I have a Black Hamburg vine which is rooted in the garden but growing in a long conservatory. Vine is about 20 yrs old and has 2 main branches, each over 30ft in length. Vine is healthy and produces a good crop but has now got too big. Can I cut the two main branches back to say 10 ft without ruining the vine and, if so, how/when best to do it? If not possible to cut back, can it be transplanted into another conservatory without too much damage?
Many thanks

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1 Comment To "Black Hamburg Vine Cutting Back as Too Big"

#1 Comment By AnnsGreeneHaus On 11/23/2012 @ 6:31 am

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