Deleting a Custom Attributes across multiple components that are the same


I have built a number of grouped components that have a custom Attribute setup that I need to change, but when I delete it or try edit it from the origanal component it doesnt change all the other components.

For eg,

Custom Attribute
Supplier: Bunnings

Then i want to change the supplier name to something else, but it only changes it on the component im editing not across all the other components that I copied from.

Is their a way to delete or edit custom Attributes across multiples of the same component?