LEAN_ON_TABLE:
1) Place a unit - init: nul = [this, "LEAN_ON_TABLE"] spawn BIS_fnc_ambientAnim;
2) Place a Camping Table (Empty -> Tents -> Camping Table)
3) Adjust so the unit is close to the table.
4) Preview.
BRIEFING_POINT_X:
1) Place a unit - init: nul = [this, "BRIEFING_POINT_LEFT"] spawn BIS_fnc_ambientAnim;
2) Get information about how long the actual animation is supposed to last (I have no idea), then preview and wait.