Reply To: How to insert a footer on every page that includes a specific word

You can use a Text Variable for this of type “Running Header” (even though you want to use it for a FOOTER; don’t worry, InDesign won’t mind).

Create a character style that applies nothing and name it “ABC Code”. Then, create a Text Variable of type “Running Header (Character Style)” that picks up that style. In your footer text frame, type “ABC Code” and insert the variable after that.

Now the footer will always contain the text that you marked with the character style “ABC Code” on that page. The name of the character style is actually not important (it does not need to match the name of the variable at all), but you need to make sure it is clear what it’s for.