Activity profiles in Shipment

Hi All,

Kindly explain me about Activity Profiles assigned for the Shipment activities.

In our company, In the Shipment, during Check in, GTS documents are created, during Shipment PGI will be done and some ASN Outputs are triggered only after PGI.

Is this standard SAP or it can customized. I checked all the Activity profiles, those are all just Variants. But how are these variants performing all these activities. Can anyone explain.

Kindly explain in detail about Activity Profiles in Shipment.

Regards,

Mullairaja