If you are updating an older MM-YYYY sheet, you need to copy costs over to the following sheets. For instance, if prep costs changed in 01-2017, and it's now Feb of 2017, copy the Jan 2017 costs into the 02-2017 sheet.
Expiry Dates
If you have a variety pack, enter the earliest expiry date in the spreadsheet, and note the individual expiry dates in a note in that cell.
If COGS changed from the last order, transfer COGs from the INVENTORY MANAGEMENT Spreadsheet to the Amazon Product COGS Spreadsheet.