I have access only to email studio and i want to suppress hard bounces and unsubscribes. So is there any automated way to do it or do I have to export them manually and then import them into suppression list?
Hard bounces and unsubscribes are automatically suppressed as per these documents describing the processes: Bounces - this one has a really good diagram explaining the process of marking a subscriber as Undeliverable, refraining from more emails being sent to that email address:
Also, unsubscribes is handled automatically, and should a subscriber use e.g. list-unsubscribe header method of opting out, the status on all subscribers list for that subscriber changes to Unsubscribed
If you indeed by writing suppress unsubscribes and hard bounces, mean ignoring them, you will need access to Automation Studio and process the data based on your data views - updating All Subscribers with this automation.
You won't be able to do it automatically with access to Email Studio only.
To be able to automate it, you would need access to Automation Studio: https://help.salesforce.com/articleView?id=mc_as_automation_studio.htm&type=5
You could then write an SQL query to regularly query the Bounce (https://help.salesforce.com/articleView?id=mc_as_data_view_bounce.htm&type=5) and Unsubscribe (https://help.salesforce.com/articleView?id=mc_as_data_view_unsubscribe.htm&type=5) Data Views and populate subscribers who are present in those tables to your Suppression list.