When the first one appears click on the Cancel button and you won't see more of these warnings. Note: the CK has a bad habit of showing lots of warning messages. Click on the OK button and CK will ask you if you want to create a new object.

The easiest thing is to look for an existing crafting recipe in game, double click on it to open the screen showing its properties and change the ID of the recipe (the first box at the top left of the screen as shown in picture Crafting recipe).

To create a new recipe for your armour or weapon: The crafting recipes are found in the CK under the Constructible Object section. The main steps to make an existing item craftable and upgradable for Skyrim are:

Creation Kit: available on Steam (Menu option View -> Tools and then select Creation Kit).

For that you can check this tutorial: Required tools It doesn't cover how to create a new item. This tutorial shows all the main steps you need to follow to make an existing item (armour or weapon)craftable and upgradable for Skyrim. Skyrim Special Edition version can be found HERE.

Move the conflicting mod or this mod higher/lower in your load order so you get the desired effect. If another mod has also altered these crafting stations in some fashion, there will be a conflict. This mod is also intended to help bridge the gaps. The primary intention of this mod is to correct logical inconsistencies in Skyrim's smithing system and to enhance the functionality and balance of crafting in Skyrim. Complete Crafting Overhaul provides the most comprehensive, consistent, and fully customizable crafting experience in Skyrim.

Skyrim se spell crafting