Hi @prasantc ,
my understanding is: SFTP is charged per Storage Account and not per container in the Storage Account.
In the Azure Pricing Calculator the costs for SFTP is calculated per Storage Account. There is no option to specify the number of Blob containers.
Source: https://azure.microsoft.com/en-us/pricing/calculator/
(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)
Regards
Andreas Baumgarten