At the current stage of development, the only capital ship action is a rebel transport attempting to get past an Imperial blockade.
On a bit of a tangent, if an Imperial Epic ship comes out, I would like the idea of building a squadron, naming it, then pairing it to a Capital Ship as a home base. Squadrons without a home base wouldn't be able to resupply (rearm ordinance, repair hull damage, etc) but could be more mobile. Hyperdrive capable ships could move a little further on their own (making the TIE Advanced useful again!)
The problem is ... or maybe isn't that the current huge ships (as standard) are not loaded out for carrier purposes. At most after severe retrofitting the vette can carry 4. Of course, in small cloak and dagger arrangements that's ideal.