The short answer is it is easiest to start a Warre hive with a package of bees and allow them to build out comb from scratch. It is more difficult to preform a split of an existing Langstroth hive with a Warre because the Langstroth frames do not fit with within the dimensions of the Warre hive. Warre hives are top bar hives and do not utilize frames as Langstroth hives do.
You can add a modified Langstroth box to a Warre hive and slowly funnel bees into a Warre. This requires some wood working knowledge. Alternatively you can preform a split by physically cutting and attaching comb from Langstroth frames onto Warre top bars. This is a challenging process that requires cutting through brood comb.
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