Hi @HimaniS
Thanks for reaching out , currently its not possible to combine multiple sheets and load into QuickSight datasource.
One workaround is discussed in the below community post by using python pandas dataframes to combine it .
At AWS, our roadmap is primarily driven by our customers.
Your feedback helps us build a better service, I have tagged this as feature request.
If you could message me separately with AWS Account id & your organization name will update the internal product feature requests.
Thanks
VInod