Creating an activity
The first step to creating an activity for your NPC is to create a name for it and add it to the enum. Here's an example name for a activity: ACT_COMBINE_BUGBAIT.
Once the activity is added to the enum, you must use the DECLARE_ACTIVITY macro in the AI_BEGIN_CUSTOM_NPC section.
Here's an example of the DECLARE_ACTIVITY code:
DECLARE_ACTIVITY( ACT_COMBINE_BUGBAIT )