First make a backup of any saved games and the file you are about to edit.
Go to game\User\Compaigns\Campaign Template\Warehouse and edit the following file:Stockpile.txt (Remember to make backup copy!!).Now enter 1000 after the colon in the file>eg: Mark23_Silenced:1000. Do this for each item you want 1000 for and than save it afterwards.You than need to create a new campaign for it to work.