microsoft excel - making a list of PO combinations that equal X using list of random numbers

I have an excel sheet that has a list purchase orders with a case value associated with each PO. for example:

3156922129  10
756941986   13
1356902364  15
3156892373  15
9156912182  17
3756902389  22

I don't have the full list posted but it has 42 instances of the above example.

What we are having to manually now is look at the PO quantities and get combinations that add up tp 75. This is the number of boxes we can fit on a pallet. At the end we end up with 26 skids with the PO's that equal to or come close to the 75 pc goal. Is there a way to take this list and have excel give you what PO's would equal to or come close to the desired 75 goal?

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