Hi Venkitta,
As per my understanding, this "Originating Template" is the attribute that gets filled automatically during the creation of the project instance. If it was created through a template then you would have seen this attribute to be filled with the name of the Template. But if you are seeing this as blank, this means that the project was not created using a template. And this attribute is not something that you will be able to change or modify. This attribute is supposed to be filled once, that also during the creation of the corresponding Project instance. Hope that helps. Let me know in case you have any further doubts.
Thanks,
Abhisek Dhar