I have a large number of quotas that need to be changed to custom notification rules.  I am able to modify one that is already set to custom, how do I modify quota notifications from system to custom while adding the new email addresses?  Does this need to be done in multiple steps?

I used this to modify an existing custom notification. 

isi quota quotas notifications modify --path=/ifs/somepath --type=directory --holdoff=0 --threshold=advisory --condition=exceeded --action-alert=true --action-email-owner=false --action-email-address=emailaddress@somedomain.com