You can manage & track your card collection and decks once you create an account and login.

Create a New Deck
Afterward, you can click on the "Change Bot/Battle Cards" button to add cards to it.

Import Deck
Upload an OCTGN o8d deck file.
Select a deck below if you'd like to overwrite and keep that deck name and URL.
If not overwriting, the filename will be used for the deck name.