tft to roc isnt really the topic, but it is possible, depending on the level of tft dependence the map exibits...
one possible way is to a, import any needed tft models, like if the map uses shadow hunter, ect. you will most likely need to re-code his spells if he uses tft ones..
if your map uses custom spells, and whatnot, i duno if importing the .w3u file is enough, but i have seen roc games with more than 3 level spells so this is also possible..
when you save a game, it says this requires tft: and has a checklist of why..
when you adress every issue on that list you can save it as roc...