Macro that calculates formula when entered from one sheet to another

I am looking for a macro that will update details in from another sheet based on a formula. The amount is at the summary level so i need to assign an amount at each detail level The formula summarize all the details amount based on a master roll number and a customer. Each line that has the same criteria master roll and customer then then a % of the total will take the amount for the data entry tab. I have upload a test example.