Hi Chaps, I'm after a bit of help with summing up some arrays, to build a Quote for a Project. - Project_ID - Job_ID (repeated for each Project_ID) - Task_ID (repeated for each Job_ID) Each Task_ID has it's own cost, so what I need to do is sum up the Tasks, to give a total for Job and likewise I need to sum up the Job totals to give a Project total. Hopefully this will give you some idea as to what I have in my database: The result I'm after is: Job_1 = £1000 Job_2 = £900 Project_1 = £1900