Hi Jaison, how many reports are you dealing with?
I'm not aware of a quick way to identify report relationships with Master Report templates, but I'm researching to see.
Maybe you could try this solution to help with visual inspection of your reports? Temporarily add text to your master template(s), then open reports to see if the temporary text shows up (or not). More specifically...
1) Check out your master report templates and temporarily add a Text Box at the top of the master template that says something like "Finance Master Template" (etc...). If you want to identify the specific master template a report is linked to, then be very specific with the text you're temporarily adding to the master template.
2) Save your master report changes (don't check in though, because you'll revert these changes to your master templates)
3) Systematically open your reports (in your dev environment) and review the report header to determine if any of your Temp Text additions are displayed on your report (wherever you added the text to the master) Reports that don't display your temporary text additions you can assume are not tied to a master report template.
Admittedly it's a brute force identification method, however it may work for you depending upon the number of reports you're dealing with.
If you were asking about tables, I'd have a quick solution for you, however for reports I don't have a trick right away (but I'm researching.)
Think this approach might help?
#CostingStandard(CT-Foundation)