First, since this is a question and not a tutorial, it should go in the main C&C subforum. I've asked the moderators to move it.
As for your question, whoward69's
Mod Tools makes it very easy.
Alternatively, you can use
Multiplayer Modpack Maker (MPMPM) to make a fake DLC with a combined set of mods, useful for creating a pack to share with others for multiplayer sessions, though it's not quite as easy a process.