I have a question is there a code that telling the AI not to mainly targeting it.

in RA2 there is one code I can't remember the code but it's giving the unit become none target from enemy unless striking them first OR gets into their way

Ex a wall. I made a wall and a tank barricade to block the enemy from running straight into my base and in RA2 enemy will try to get into your building and they just simply shoot the wall and get in or just simply running to your front door.

But in my case will just keep destroying each wall segment.

MISC_MAN_MADE sorting type will make the game crash. Right now I am thinking to put UNATTACKABLE instead but down side is wall will become so indestructible to direct fire only area damage can be done to it... hmmmm

I'm not sure about Generals, but C&C 3 was a KindOf called "NOT_AUTOACQUIRABLE" that prevents units from automatically attacking it while still allowing the player to order it to attack. You should try it and see if Generals accepts it.

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This is all the list for Generals. Not sure which one.

KindOf list:
IGNORE_DOCKING_BONES
CONSERVATIVE_BUILDING
DEMOTRAP
EMP_HARDENED
TECH_BASE_DEFENSE
CANNOT_RETALIATE
REJECT_UNMANNED
NO_SELECT
AIRCRAFT_CARRIER
OPTIMIZED_TREE
PROP
BLAST_CRATER
BOOBY_TRAP
REVEALS_ENEMY_PATHS
MONEY_HACKER
CLIFF_JUMPER
DONT_AUTO_CRUSH_INFANTRY
IGNORES_SELECT_ALL
HERO
INERT
DISGUISER
REVEAL_TO_ALL
SUPPLY_SOURCE
CANNOT_BUILD_NEAR_SUPPLIES
SPAWNS_ARE_THE_WEAPONS
SHOW_PORTRAIT_WHEN_CONTROLLED
HULK
IMMUNE_TO_CAPTURE
BOAT
GARRISONABLE_UNTIL_DESTROYED
PARACHUTE
PARACHUTABLE
SUPPLY_SOURCE_ON_PREVIEW
CLICK_THROUGH
BALLISTIC_MISSILE
CAN_SEE_THROUGH_STRUCTURE
DRONE
PRODUCED_AT_HELIPAD
POWERED
TECH_BUILDING
AUTO_RALLYPOINT
FORCEATTACKABLE
LOW_OVERLAPPABLE
AIRCRAFT_PATH_AROUND
DEFENSIVE_WALL
WALK_ON_TOP_OF_WALL
ATTACK_NEEDS_LINE_OF_SIGHT
ALWAYS_SELECTABLE
PORTABLE_STRUCTURE
CLEANUP_HAZARD
MINE
UNATTACKABLE
ALWAYS_VISIBLE
SMALL_MISSILE
CLEARED_BY_BUILD
CAPTURABLE
CRATE
IGNORED_IN_GUI
MOB_NEXUS
CAN_BE_REPULSED
CAN_RAPPEL
NO_HEAL_ICON
SCORE_DESTROY
SCORE_CREATE
SCORE
REBUILD_HOLE
MP_COUNT_FOR_VICTORY
DRAWABLE_ONLY
CASH_GENERATOR
STEALTH_GARRISON
HEAL_PAD
REPAIR_PAD
NO_COLLIDE
WAVE_EFFECT
WAVEGUIDE
NO_GARRISON
PRELOAD
PROJECTILE
BRIDGE_TOWER
LANDMARK_BRIDGE
BRIDGE
TRANSPORT
WEAPON_SALVAGER
ARMOR_SALVAGER
SALVAGER
LINEBUILD
COMMANDCENTER
HARVESTER
DOZER
HUGE_VEHICLE
AIRCRAFT
VEHICLE
INFANTRY
STRUCTURE
SHRUBBERY
CAN_CAST_REFLECTIONS
STICK_TO_TERRAIN_SLOPE
CAN_ATTACK
IMMOBILE
SELECTABLE
OBSTACLE
FS_STRATEGY_CENTER
FS_SUPPLY_CENTER
FS_BLACK_MARKET
FS_SUPERWEAPON
FS_SUPPLY_DROPZONE
FS_AIRFIELD
FS_WARFACTORY
FS_BARRACKS
FS_ADVANCED_TECH
FS_TECHNOLOGY
FS_BASE_DEFENSE
FS_FACTORY
FS_POWER
FS_INTERNET_CENTER
FS_FAKE