How to use SUMIF to cross reference two sheets


I am working on a sheet, Electrical Inventory Modification, that collects part numbers and quantities based on a form that employees fill out. I have another sheet, Electrical Inventory List, that already has a list of parts and quantities. I want the Electrical Inventory Modification sheet and the Electrical Inventory List sheet to automatically take the part number and cross reference it with the same part number on the other sheet. I then want the two list to add the quantities together onto a third sheet. The third sheet will then just have one part number and quantity per item and have the correct number of items added from the other two sheets. Is something like this possible in Smartsheets? 




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