See also
Is there any way to know which template was used to create a project?
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Gurjeet:
As Chris mentioned we can think different options for the Future Data but it doesn't look like Clarity contains any direct information for already created projects from templates.
If it is really urgent and you are happy to spend time then below count queries can help you to eliminate some data.
Select Count(*) from prdependency where prpredtaskid in (select prid from prtask where prprojectid = ???? ) ;
Select count(*) from prtask where prprojectid = ???;
For future you can use Chris advice.
Martti K.