Run initautosys.exe file under autosys bin installation such as the following PATH
D:\Program Files (x86)\CA\Workload Automation AE\autosys\bin\initautosys.exe
it will switch to 'Administrator: CA WAAE Command Prompt' as follow
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
D:\Program Files (x86)\CA\Workload Automation AE\autosys\bin>
and you will be able to run any autosys command