A bank statement by definition is the summary of financial transactions, which typically shows your deposits and withdrawals, during a specific period of time.
Bank Balance Certificate is a document issued by the bank that shows that an individual has a certain amount of money in this account.
Bank Statement and Bank Balance Certificate are required, to apply for a student visa of different countries. In order to obtain them, you need to visit the bank where you own your bank account. Depending on your bank, you might need to fill out a small Bank Statement and Bank Balance Certificate form. So, as you enter the bank, ask if you are required to fill out a form, to obtain those.
Fill out the form and then wait in a queue. In most banks, both Bank Statement and Bank balance certificate are issued at customer service department or reception of the bank. Some banks might have a separate department for Bank Balance Certificate and Bank Statement. For example, at NIC Asia Kamaladi Branch, when I visited, Bank Balance Certificate was issued on the ground floor and Bank Statement was issued from the counter on the first floor. However, the branches of NIC Asia bank of Gongabu and Samakushi provide both services from the reception. Depending on customer flow, different branches have different arrangements as to how they provide their services. Make sure how your bank provides those services.
If you have to take a token, take the right token. In some branches of NIC Asia, for instance: NIC Asia Gongabu Branch, there's a separate token called CSD which is called Customer Service Department. However, up until the day I visited the NIC Asia Samakhushi Branch, there was no token system. Things might be different in the future and depending on the branch and bank you visit.
Normally, issuance of Bank Balance Certificate and Bank Statement should not take much time. However, sometimes, the system of the bank to generate Bank Balance Certificate might not function and you might be required to wait for long hours. E.g. Nabil Bank Maharajgunj Branch, had made my friend wait for the entire day citing their system was not functioning, which normally takes around 30 minutes or less, when the system is working normally.
When visiting your bank, make sure everything you need is in order, so you get the document you need without much hassle.You need to have your account number handy because you need to fill that in the form. Also, fill out address and other details as per your Citizenship Card.