You can delete a dimension or a dimension value if it is not in use. If it is in use, a blue dot appears next to its name. To delete a dimension value, you must first remove it from use everywhere. As part of this, the administrator should determine which sheets and versions are using the dimension, locate the data tagged with this particular dimension, then de-select this dimension value on all data.
Select a dimension value and click View Dependencies in the details panel to see where a dimension value is referenced.
When you delete a parent dimension value, you are deleting all values that roll up to that value as well.
Select the dimension or dimension value you want to delete.