Hi @nparsonsF3LTA. What you seem to be asking about is very vague. Of course we can modify text, but this is a vast subject, because there are lots of places and types of things that can contain text. Each different type of object has different ways of modifying things. The TextStyle object is basically just an initial guide for when originally creating new text in certain places. However, the text is generally not forced to use the settings of the TextStyle, because most of those settings can be overwritten. So, simply changing some text from one TextStyle to another may not have the result you want, due to overwritten settings. Some things are protected also, so making changes to them is more difficult, or maybe even impossible. Examples of this are the Border, TitleBlock, and SketchedSymbols. Those are protected from changes, so you must go about changes to those in very specific ways. There will not be any one simple iLogic rule that can be used for every possible case of changing the style of existing text in all possible scenarios and locations. Please be much more specific.
Wesley Crihfield

(Not an Autodesk Employee)