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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
It's not what is meant by copying and pasting being problematic in context of Codewars. Working in local IDE is perfectly OK, and by some (for example me) strongly recommended way of working with kata.
If you use your account to read the kata, grab the initial solution and tests from the trainer, solve the kata in your IDE and then paste it back into the trainer to submit, it's perfectly fine, you do not need to retype anything.
Not that copy/pasting was meant.That was about copy/pasting of other user's solution from internet or codewars.