You can own any SKU by cloning the same. To understand, how to clone an SKU, refer to this article below,

http://help.infurnia.com/en/articles/8711363-how-to-clone-a-sku

If you want to own an entire group of SKUs to modify it, you can bulk cone the entire group. To understand, how to clone a group, refer to this article below,

http://help.infurnia.com/en/articles/8711014-how-to-clone-an-entire-group-in-your-catalogue