In order to add a custom field to a consumable, you'll need to add the custom field to the category the consumable is using. That way, it will appear for all consumables using that specific category.

Let's add a custom field to the consumable below, Canon 580 PGBK Printer Ink.

Start by clicking on the category of the consumable.

Now, click on the Edit button.

Scroll down on the page until you see the Custom Fields section, and click on the Show button. This is where you can add your own custom fields that will appear for all consumables using this category.

These are the types of custom fields you can create:

You can also choose if the custom field should be a required field or not. To add options to a Dropdown List custom field, you just need to fill out the Dropdown List Content field using this format: ["Option 1", "Option 2", "Option 3", ...]

In this example, we've added one custom field; Color (Dropdown Field).

Once you've added the custom field, scroll down and click on the Save button. Then, go back to the consumable page and click on Edit Consumable.

After scrolling down to the bottom of the page, we can see that the custom field we added is now visible and can be filled out for the consumable!

Once we've filled out the custom field and saved, we can see that it now appears for the consumable!

In order to remove a custom field from a consumable, you just need to go back to the Custom Fields section of the Edit Category page and make the Field Title field empty for the custom field you'd like to delete, and click Save.