If you're using Peakd, you will see this at the bottom of your post and click the three dots.

It's like the crosspost feature on Reddit, what it does is just basically posting your post to another communities without you having to make a 'new post' for the same content to different communities. Hmm, a bit like retweet. You don't need to remove all the content though, you can just put a disclaimer at the top maybe, to let the curators know you have posted this multiple times without knowing much about how communities work.:)