Assigning Spells to Universal Lists?

[Kotemaki]

Sooooooo. I am using FGU and the 5e system to help with randomizing my writing process of battles, so I am entering some custom things. I was wondering, if in the source of a spell if I am able to assign it to EVERYONE's spell list with at once, or do I really need to go through and assign everyone to it? Like can I put "all classes" or something along those lines to allow all classes that allow spellcasting to use it?

I understand that spellcasting is different for everyone, but not everyone can use the same spells even if its in a material or vocal way. I just want it to be available to everyone with least amount of work on my side. I have a quite a few that I would be adding that are chosen by feats. It would be very annoying doing all the prep work I am now, just get to the battle to find out I forgot one in the source.

Thanks for your time!

[Zacchaeus]

The source section of the Spell is there so that you can filter spells by the class that can use them. You can add whatever you want into that field; in other words you don't need to confine it to a particular class. Whatever you add to that field will create a new filter option in the spell list. So if you add All Classes to the spells then you'll be able to order the spell list using that filter. What that won't do is automatically add those spells to any class or all classes since All Classes isn't a class. So those spells won't appear in the list of available spells in the Character Wizard for example or if you filter the spell list by Wizard or Cleric.
Doing this will also creates a new Class spell list with whatever you add to that field so you'll be able to find that list in the Class Spell List and link that list to whatever you want.