XF 1.1 Theme updating?

Well Xenfocus just updated there themes and i want to know how to update the theme without losing codes that i have added can someone please tell me how this is possible
 
When you upload a style on top of an existing style it completely overwrites and replaces the existing style. It's like deleting the existing style and creating a new style. It doesn't do a merge. If you use a child style for your customizations then you can safely overwrite the parent without losing your customizations.
 
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