Delete registry key in security template

Hello,

I am using security template to harden windows.I have used .reg file before
to harden registry along with template but now I want to add all registry
modifications within security template which is .inf file.
Using .reg file I can put "-" to delete keys in the begining of line but not
sure how to do this in template.
I am able to add registry keys without any problem..but not sure how to
remove registry keys.

appreciate your help.

Thanks