If you want to create multiple alias for same account, you can follow these steps:
Step 1: Open BUSY and select the company you want to work with. Then, go to the Administration tab and click on Configuration.
Step 2: Under Configurations, select Features / Options and then click on the Accounts tab. Here, you will find the "Maintain Multiple Account Aliases" option. Just click on the checkbox to turn it on.
Step 3: Now, open your account master and look for the “Multiple Aliases” window. In this window, you can enter the aliases you want and save them.