Troubleshoot:2 worksheets need to combine multiple row amounts of 1 worksheet against a single cell on another worksheet Error

2 worksheets need to combine multiple row amounts of 1 worksheet against a single cell on another worksheet

Good morning, I have 2 worksheets

Sheet 1 has the high level of what the customer paid (single line item showing a total of X number of dollars)
Unique cols are;
A (Customer number
B (Quarter in which they paid)

Col C is the high level payment

Sheet 2 has the line items of what each customer (break out of sheet1)
A (Customer number)
B (Quarter in which they paid)

Col C (with muitiple row entries) - has what the customer paid for each part

What I need to do is add up the total amount from lines items belonging to the customer sheet 2 for customer X then get the percentage discount  (1-(sheet 1 /sheet 2)) by comparing it to the total paid (sheet 1 Col C), then put that discount in all the col
D (sheet2) for each line item that match the Customer number and Quarter on Sheet2

Any suggestions would be greatly appreciated

Solutions to the Problem 2 worksheets need to combine multiple row amounts of 1 worksheet against a single cell on another worksheet

Im D2 on Sheet2, as an array formula, confirmed with Ctrl+Shift+Enter:
 
=1 - INDEX(Sheet1!$C$2:$C$100, MATCH(A2 & B2, Sheet1!$A$2:$A$100 & Sheet1!$B$2:$B$100, 0)) / SUMIFS($C$2:$C$300, $A$2:$A$300, A2, $B$2:$B$300, B2)
 
Adjust the ranges to suit your situation.
Fill down as far as needed.

Using System Restore

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Note: There is the option on the restore utility to select "Choose a different restore point". Unless you have a specific reason to select a different date and time than what Windows recommends, just select the recommended option stated in the steps above. If you choose to select another one, follow these steps:

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Once completed, click Next and follow the instructions given.

Once you have selected the restore point, your system will start the restoring process, after which you will have to restart the system.

Recommended Method to Repair the Problem: 2 worksheets need to combine multiple row amounts of 1 worksheet against a single cell on another worksheet:

 

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