Goals

Move the brush to the desired position and right click -> Add Volume -> GoalVolume_TA to create goals. In the properties window, set Team number 0 for blue, Team Number 1 for orange.

If the game crashes when you score a goal, add a PointInSpace_TA in the center of the map and set the goal orientation to that.

Derzo almost missing an open net

Gravity

Move the brush to the desired position and right click -> Add Volume -> Gravity Volume. You can change the gravity in the properties window.