When you tag elements in Breakdowns each tag is saved to your Element List. Any tags that have the same name, such as a Cast Member Element, are automatically grouped together. However, if you need to change all of an Element's tags at once, just follow these steps.
Step 1 — Go to your Elements page
In Elements select a category and click View Elements.
Step 2 — Select an Element
Select an Element from the list and click the More Icon (⋮) to the right, then click Rename Element.
Step 3 — Save New Name
Retitle the Element, then click Save. The Element's tags will update throughout the Breakdown to reflect the changes made.