Create SIP extension with AMI

I want to add/edit/delete local sip extensions using a website.
At the moment, I use PHP to make a connection over AMI and I’m able to edit or delete a field of an extension using updateconfig.

action:updateconfig
reload:yes
srcfilename:manager.conf
dstfilename:manager.conf
Action-000000:append
Cat-000000:newuser
Var-000000:secret
Value-000000:nottelling

But I don’t see how/if it’s possible to delete the whole extension using AMI.
Is this possible or am I going in a wrong direction?

Thanks