With BUSY, you add HSN codes in the Item master when creating it or modifying if. You can follow these steps to add them.
Step 1: Open your company, then, go to Administration tab.
Step 2: Select Masters the click on Item.
Step 3: Click on Add and enter all the necessart details such as Name, Group, Unit, etc.
Step 4: Also you can enter the HSN code in the field available called HSN/SAC Code for GST. You need to enter HSN code based on the turnover.
You can also modify your existing items to add HSN codes.