Is there a way to extend the amount of values for inspector?

I'm making a dialogue system that works as following:

Dialogue Text Class

1. dialogue line 1

2. dialogue line 2

3. dialogue line 3

   ---

• player answer 1 -> new dialogue text class

• player answer 2 -> new dialogue text class

• player answer 3 -> new dialogue text class

  ---

This tree system goes on as long as it needs to. Problem? 6 cycles in (dialogue, choose option, new dialogue, choose option, new dialogue, choose option...) it doesn't give an option to spawn a new dialogue class under the last player choice. I'm assuming this is because the inspector can only hold so many variables under each other, but if i'm wrong please correct me. Either way has anyone encountered this before or know of a way around this / fix this? My current work around is to launch a separate and brand new dialogue tree from the last player choice, but that's a gimmicky solution and causes a lot of extra work especially when I have large quantities of dialogue and npcs to work with.