BigCommerce site: Update product details

Our BigCommerce site has 700 active products, and we need the following details changed, added or updated: I tried to do all of this by product import: See footnote that explains why you cannot use the product import feature (CSV import) to make these changes: These changes have to be made manually in the Control Panel or else you will change the categories of all the products. Change price of 71 products: I will provide a list, by product name, with the existing price and the price that we need it changed to (changed manually). I will provide the following information in an Excel file, so that you can make these changes manually in the Control Panel (not by CSV import): Put the Manufacturer's Part# (MPN) in the Keywords field Change the stock level Input the low-stock level Enter a Page Title (that I will provide) in the Page Title field (this is not the Name field: This is the Page Title for SEO) Enter Meta Description (I will provide) Enter product image description for the main image (the one used as the thumbnail): This will be the same as the Page Title. FOOTNOTE: I tried to make all of these changes by product import: The problem with this, is that in the preview before the products are imported, BigCommerce says that the Categories of all 700 products will change in some way, and shows details of how the Categories will change. This is in spite of the fact that I used the same product categories that I had just exported, minutes before. There is no way to import product details for an update without using the Category field, and using the Category field would change all of the categories of the products, which is totally unacceptable. I also tried using the Bulk Edit export/import feature, with the same result.