Much like adding performers in a new drill, you can add performers to an existing drill by drawing the performers with any of the Drawing tools, while both anchors on your Count Track are together.
If you need to add multiple people, such as the drum line or color guard, this would typically be the quickest method to adding performers in an existing drill.
If you only need to add a few people, you might want to consider using the Drill Rewrite function. More on that here.
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