Bees need 3 conditions to draw comb, there needs to be a nectar flow, it needs to be warm enough for them to secrete wax, and they need to feel they are out of space (people also sometimes include a 4th, bees of wax producing age, but older workers will revert to producing wax in an emergency). If one of these conditions isn't met the bees probably won't draw. If you don't have a nectar flow you'll need to feed them. Most people feed 1:1 syrup in the spring, with or without additives, but of course be sure it's warmed up enough so the bees can use it, and obviously so the bees are unclustered. But if they have empty comb in the hive to fill, they still won't draw until they've used up that space first. I am also foundationless, so I can't speak to issues with bees rejecting foundation. If you are having trouble, you can always wait and have the hive and the split draw new comb when you split them. As long as it's warm and there's a flow by then, the split will obviously feel out of space, since they won't have much drawn comb.