Delete and Add Site Templates to Sharepoint V3 and MOSS 2007
stsadm -o deletetemplate -title "Extranet Project"
stsadm -o deletetemplate -title "Extranet Root"
stsadm -o deletetemplate -title "Extranet Support"
stsadm -o addtemplate -filename "ExtranetProject.stp" -title "Extranet Project" -description "Extranet Project Site"
stsadm -o addtemplate -filename "ExtranetRoot.stp" -title "Extranet Root" -description "Extranet Project Site"
stsadm -o addtemplate -filename "Extranetsupport.stp" -title "Extranet Support" -description "Extranet Project Site"