Hi sarifnon,
This is a subjective determination that you have the best idea how "closely related" these activities are.
If they are unrelated activities, then each should be reported on separate Schedule Cs. You just cannot combine two activities for the purpose of hiding a loss from one of the activities.
From you description, it seems to me there are two themes:
* teach/instruct/educate/use a computer software;
*theatre/acting - either working as a crew, or be an actor.
Hope this helps. Thank you.