Fusion Application customizations can be imported to the MDS repository via Enterprise Manager, usually accessible at http://server:port/em on a standalone WLS. There are times when you want to delete the imported customizations to see the uncustomized page during development and testing cycles. It is quite easy to delete metadata customizations to rollback the application to its original state by following these commands: On your server locate and execute the wlst.sh. It is typically in the below location:
<WLS server path>/atgpf/common/bin/wlst.sh
connect('<weblogic user name>','<weblogic password>','t3://<server name>:port')
Command reference is here
which explains the syntax in more details and wild card options to delete more than one MDS document at once.