BUSY has as feature of royalty calculation, to configure it follow these steps:
Step 1: Go to Administration then click on Configuration.
Step 2: Select Features / Options and click on Accounts Tab.
Step 3: Tick the option called Royalty Calculation and save changes.
Step 4: Next, you need to create Author by going to Administration then Masters.
Step 5: When you create your item for roylty you need to mention Author and calculation percentage.
Step 6: After, posting vouchers you can calculate roylty by going to Display menu and click on Roylty Calculation.
Step 7: Select either One Author or All Authors and enter the date range and check the roylty amount.
Step 8: You can post Roylty Calculation voucher by press F4.