How to bulk update lookup fields

How to bulk update lookup fields

"I have a primary key named Product SKU in one form called Master SKU (which contains details like price, color, size, etc.). I also have another form called FBA, which has the same primary key, Product SKU, and contains stock quantity information for different ages. Additionally, I have a third form named Discount Price Calculation. My requirement is to fetch all the SKUs from the Master SKU form into the Discount Price Calculation form and match the records from both the FBA and Master SKU forms."


MASTER SKU FORM
product sku
price
3m orders etch

FBA FORM
product sku
inventory age 90 days
inventory age 190 days

Discount calc Form
product sku (want to fetch all skus from master sku form)
price
3m sales
inventory age 90 days
inventory age 190 days