Can I link a current bank account to my ATS account?

Yes, you can link a current bank account to your ATS account as both primary and secondary, provided that the name in ATS account matches your PAN and bank account.
You can update the bank details by accessing the profile section.
see How to add a secondary bank account to my ATS account?

POINTS TO BE NOTED

▪ To add a current bank account as a primary or secondary bank account, one more extra document is required to be submitted i.e., a self-attested copy of the bank letter that states that the account holder solely runs the business and will make all the transactions.