Make interface part, is easy, just view prints

Print1: http://image.prntscr.com/image/ea4999dc010d492dbe24b5295d6e20be.jpeg
Print2: http://image.prntscr.com/image/b76795ca2dec47998326aff0c091b469.jpeg
Print3: http://image.prntscr.com/image/f7b54c720e794975b82b101221ae18f1.jpeg (very important)

Open \classes\warz\frontend\InventoryScreen.as

Search:
Inventory.BtnChange.Text.Text.text = "$FR_PAUSE_INVENTORY_CHANGE_BACKPACK";

Add bellow
// [LCCB] - MoveAllItems
Inventory.BtnMoveAll.Btn.addEventListener(MouseEvent.MOUSE_OVER, ButtonRollOverFn);
Inventory.BtnMoveAll.Btn.addEventListener(MouseEvent.MOUSE_OUT, ButtonRollOutFn);
Inventory.BtnMoveAll.Btn.addEventListener(MouseEvent.CLICK, ButtonPressFn);

Search:
Inventory.PlateBig.visible = survivor.globalInventory;
Inventory.BtnChange.visible = survivor.globalInventory;
Inventory.SplashScreenNoGlobalInv.visible = !survivor.globalInventory;

Add bellow:
Inventory.BtnMoveAll.visible = survivor.globalInventory; // [LCCB] - MoveAllItems

Search:
else if (button == "BtnChange")
{
	Inventory.BtnChange.State = "off";
	Inventory.BtnChange.gotoAndPlay("out");

	FrontEndEvents.eventOpenBackpackSelector ();
}

Add bellow:
else if (button == "BtnMoveAll")
{
	Inventory.BtnMoveAll.State = "off";
	Inventory.BtnMoveAll.gotoAndPlay("out");

	FrontEndEvents.eventMoveAllItems();
}

Open \classes\warz\events\FrontEndEvents.as

Search:
public static function eventOpenBackpackSelector ()
{
	send ("eventOpenBackpackSelector");
}

Add bellow:
public static function eventMoveAllItems ()
{
	send ("eventMoveAllItems");
}