Note:
When you delete a style, any customized templates, CSS, StyleVars or replacement variables belonging to that style will be deleted along with the style.
On the other hand, if the style you choose to delete has one or more child styles, an extra step will be added into the deletion process should you choose to continue with the deletion.
Any child styles of the style you delete will not be deleted, but rather they will be attached to the parent style of the style you have deleted.
For example, if you have a style arrangement of
Custom Header / Footer
-- Red
-- Green
-- Blue
---- Big Font Blue
... and you chose to delete the 'Blue' style, then the child style of 'Blue' will be attached to the parent style of 'Blue', resulting in this:
Custom Header / Footer
-- Red
-- Green
-- Big Font Blue
Note:
When deleting styles that have child styles, be aware that any customizations made in the style to be deleted will no longer appear in the child styles after the style has been deleted.