Bi Folds are a bit complex to build, if you want the capability to swap bifold panel styles, and have them be operable, and so on. All doable, mind you.

As Karalon said, you can find them on sites like BIMObject, or you can also (sometimes) find them from a manufacturers website.

The achilles heel with both of those options are that youll want the door to also function with your door schedule and the parameters used in your door schedule. Doors are HEAVILY scheduled, and because of that, they typically need to be from the same "ecosystem," or they dont work well together. For that reason, getting bifold doors as part of a "library" is a more sustainable way to go. That, or building your own homegrown ones (which is an undertaking, but a fun and worthwhile experiment!).

Yup. Building your own doors is a fantastic way to become a skilled family creator