If you have NEI installed, hitting R and U (or whatever you have configured them to be) while hovering over an item will show you the recipes to make the item and recipes you can make with the item you hovered over. You can also do this in the full list of items it shows on the right-hand side.
I don’t have anything mentioning wooden shield scraps however so it’s probably from something I haven’t added and not something related to Gregtech.