It depends on the type of soil you have naturally. You don't want to use a lot of commercial potting soil in the planting hole if your own garden soil has a lot more clay or rock in it. Rose roots don't like to travel from one type of soil to another, so resist the urge to create a new bed with lots of potting soil unless your own soil below the layer of potting soil is sandy loam.
After you move them, please resist the urge to fertilize them. Newly planted roots are fragile and will be burned up by chemical fertilizer. Don't use any commercial fertilizer until the roses are thriving in the new spot. You can use various types of organic, non-chemical matter to perk up your roses, however: a handful of Epsom salts, alfalfa pellets, bone meal, etc. I have always planted my roses on top of a banana peel and an egg. I don't know how much it has helped them, but it certainly hasn't hurt them.
