I'm trying to create a wizard subclass that has, at certain levels, the ability to add spells from outside of the wizard spell list. I'm trying to figure out a way to create an option that allows you to learn one or two spells from a list of all non-wizard spells (or even just all spells). Does anyone know how to do this?

Yes, if you create a class feature and [ADD A SPELL] to that feature. You have options for how to proceed:

• The very first field is labeled “SPELL,” if you add more than a single spall to that field it will register as a choice the player can make and will only allow them to select a single spell from that list. If you put X spells in that field, the player will be able to only choose one spell from that list of X.
• The  second and third fields are labeled “SPELL LEVELS,” and “SPELL CLASS.” If you want the player to be able to choose a single 1st-level spell, then select “1” from the level dropdown and select every class except Wizard from the class dropdown. It will register as a choice the player can make and will only allow them to select a single spell from that list it will generate. (There will inevitably be some overlap, even with the Wizard spell list. That is unavoidable.)

If you want them to be able to choose two spells, then [ADD A SPELL] to that feature twice and simply repeat the same steps for the second instance.

Thank you very much! This worked percectly.