You will need to create multiple text node node and blend them together with multiple blend nodes. If you have a grayscale text node, then be sure to change the blending mode of the blend mode to something like "add" or "max".
I'm new with substance designer, so forgive me if this seems like a basic problem. I can't seem to blend several text nodes together in the same texture space. I've checked the wiki and can't seem to find a way of doing this. Let's say, like a control panel, how would I go about adding text to all of that within substance…
Ah, that does it! Only issue i'm having now is getting it to blend on top of other nodes. I'll keep messing with it, but thank you for the reply @Froyok!