You have to know lua.
Find a spawn function and use :

ply:CreateSCPInventory() -- To create the inventory of the player

ply:SCP_Inventory_GiveLoadout( "ent_fak", "ent_hazmat_suit", "card_lvl_4" ) -- Insert all entity you want to give , write the class name

引用自 Xenikay：

You have to know lua.
Find a spawn function and use :

ply:CreateSCPInventory() -- To create the inventory of the player

ply:SCP_Inventory_GiveLoadout( "ent_fak", "ent_hazmat_suit", "card_lvl_4" ) -- Insert all entity you want to give , write the class name

I've done that; I mean how do I load all the keycard levels on buttons, doors, etc. without having to execute SCPLoadKeycardLevel each time

引用自 Сергеи Волоков：

引用自 Xenikay：

You have to know lua.
Find a spawn function and use :

ply:CreateSCPInventory() -- To create the inventory of the player

ply:SCP_Inventory_GiveLoadout( "ent_fak", "ent_hazmat_suit", "card_lvl_4" ) -- Insert all entity you want to give , write the class name

I've done that; I mean how do I load all the keycard levels on buttons, doors, etc. without having to execute SCPLoadKeycardLevel each time

You could try to put the Command in the Autoexe of Gmod. You can find it in the datapath of Gmod. Then when you have done that the Command automatically executes when you start up the game. You can find Autoexec.cfg in Steam/steamapps/common/GarrysMod/garrysmod/cfg