Pull price from Standard Buying as valuation rate for stock reconciliation?

Hi, We are looking at doing our opening stock reconciliation but it asks for a valuation rate for each product. We have already uploaded all our items, and their buying price and selling price. We don’t have historical info so we would be using the buying price to enter the valuation rate anyways, but it’s not pulled. So would we need to manually add every single valuation rate when we already have a standard buying price?