Mobile application
Select Settings > Catalog > Options.
Select the option to delete. The Edit Option window is displayed.
To delete an option value, select x next to the value.
To delete an option set:
Delete all option values within the option set by selecting x next to each option value.
Select Delete.
If the option set or option is not assigned to any items, it is deleted from the system.
If the option set or option is assigned to an item, a message prompts you to confirm the removal.
If you select Delete, all variants in items related to the options are removed.
Web application
Select Catalog > Options.
The Options Management window is displayed.
To remove an option value in an option set:
Select the option to edit. The Edit Option with Variants window is displayed.
Select
next to the Value Name to delete.Select Save.
To delete an option set:
Select
in the option row and then select Delete. 
A confirmation message is displayed.
Select Confirm.