Hi Moni,
It is for both inbound and outbound delivery. If your plant and storage location in Inbound or outbound delivery is WM managed, you can use LT03 to create TO. This can be automated through message type WMTA as well.
For Inbound delivery TO is used for put away.
For outbound delivery TO is used for picking.
Thanks and Regards,
Prabakaran Gurusamy