You can still add it as if its a straight sided ball bit… HOWEVER if the design has tall, straight sided walls, the tapered ball bit will remove excess matrrial at the tops of the walls and distort the design a bit… but if the design doesnt have these features, then the tapered ball bit will work fine…just remember easel wants the tip diameter, not radius! So multply the radius by 2 to get diameter and enter that value as the width.