Relationship Clone issue


I am trying to clone the Item in null relationship.

I had created the template and i want to use the same template in program or Product, similar to project. 

I had created the Property and given the data source as Project Template, i am able to select the template and save it .

also, i created null relationship.

but my requirement is when i will save the Item, Template should cloned in null relationship.

any help regarding this will highly appreciated. Thanks in advance