Try.
crtetae 2 table for the order.
1st one for the overall order_details and 2nd one for the the item_details for the order.
like this.
Tabl_Item
--Ok
Item_id(Primary_key)
Item_name
Item_price
Table_Order_master
order_id(Primary_key)
order_name
Waite_id
TAble_no
Order_detail
time
Table_Order_Details
ID(Pk)
order_id(Foreign_Key to Table_Order_master)
Item_id(Foreign_Key to Tabl_Item )
Qty
.
.
etc