This is very short but here it goes - No Pictures or telling what goes where.

CREATE BREAKABLE WOOD
1) Each trigger_damage has a targetname of "wood_splinter"

2) Each trigger_damage targets the script_brushmodel of the pieces of wood to break

3) Each piece of wood to break targets the script_brushmodels of the broken pieces that will show when it's broken

4) Give the trigger_damage a 'script_noteworthy' to wait for a notify to be given before the wood can break

example: 'script_noteworthy' of 'wood_time' will wait for 'level notify ("wood_time");' before pieces are breakable

5) Exec this script at the start of your level - "maps\_wood::main();"