Hey @Krishma and Happy Friday!
I’m glad to see that campaign association helped for you! 
Also, thanks so much @EugeneAtKiwi for your insights, we appreciate it! 
Regarding your follow up question, I can see on this Idea " Parent-Child hierarchy feature for campaigns " that we have a public Beta for this “Multi-campaign reporting”. Here is how to opt an account into a Beta.
You can use folders to organize your campaigns, and you can create campaign hierarchies (i.e., parent/child structures) to manage your campaigns. From the folders view, you can, for example, select the “analyze campaigns” button to view all campaigns in your selected folder (and its respective subfolders). For that, you’ll need a Marketing Hub Professional or Marketing Hub Enterprise.
I understand that this is what you were looking for, is that correct?
Thanks and have a wonderful weekend!
Bérangère