And to clarify, I'm not talking about "Why is this function in a different menu than what I'm used to" but "Why does GPlates require me to export my continent coordinates into a text file, copy a line in that file by hand, give that copy a new ID, make sure I made no syntax errors, re-import the text file and then edit the shape of both copies just to split a continent in two halves?" I know how to do that, it's not too hard to learn. But if there was a knife tool or at least working copy and paste, I could reduce that task from minutes to seconds.