I think you have to do your MP and then transform it with the face selector and the knife. That's how I do it, but maybe, there's another way to get, for example, moving curves like in Steven's old levels (Brown Zone), remember?
You forget a thousand things everyday. Make sure Marble Blast isn't one of 'em.
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That's one big bump! But, it's okay because I'm still not able to do this.
Could you go in more depth about face selector and knife? Which converter do you use? Are you on a mac?
Why yes I do remember Steven's old level! they were awesome.
For now I'm just using moving platforms from other "default" levels, especially Master the Marble and Epoch Artefice.