Adding up the cost of each item stored in a subform

Miller84

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How do I add up say RentalCost of 3 items in one order so that it appears in the main form as a subtotal. Is it use of the SUM function or is it more complex?

Thanks
 
Just add a footer to the subform and place the =Sum(somefield) there.
 
Ye, there is always a bigger fish.
I knew that there should be a control based solution but I couldn't tell what that would be....
 

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