With BUSY Enterprise edition, you can set approval for masters and vouchers for different users. To configure this, follow these steps:
Step 1: Go to Administration and click on configuration.
Step 2: Select Features / Options and click on Enterprises Features.
Step 3: Here, you will a feature called Enable Voucher / Master Approval, set Y on that to turn it on.
Step 4: Now, click on Configuration and select Vouchers for transaction.
Step 5: Enter your voucher type, voucher series, users who can approve, allow printing, etc as per the requirements and save the configuration.
Step 6: The the user you assign for approval can approve the transaction under the Check List in the Display menu.
Further can go through out video tutorial and help document available with feature for more information.