I know nothing about symbols, but it seems to me that you'd have to have created the "embedded" symbol previously, so why not edit that? It's my limited understanding that changing a symbol will change all occurences of where it is used... no?
Yes. I just tried it. I created symbol A, then made symbol B with symbol A in it... I changed symbol A and symbol B changed... Very simple color squares, so maybe if you have something complex your solution might be more complex...
I only want to change the instance of a symbol with an embedded symbol inside it. I have an icon embedded in another Symbol. I can edit the instance color (Not the original symbol color) since I only need 1 color variation. It's not letting me edit the embedded icon symbol though.
Never nest symbols. There used to be a serious issues of crashing, not printing or making PDFs. While this version of Illustrator might be working, you are setting yourself up for disaster.
Why are you nesting them? Unless you have a huge project with 100s of symbol varaiotns with a common element, abandon this nesting.
Symbol nested into a symbol is not a good practice as Mike suggested.
Anyway, if you want to change an individual instance of a symbol, make sure that when you create the symbol for the first time chose Dynamic Symbol instead of Static symbol, this way, using the white arrow tool you can select and change something on an instance of the symbol, but limited.
Thanks. I have a main icon and it's used in different logo versions. If I ever edit it, I wanted it to change in all versions of the logo.