Well, here is the thing. Italy was an awful ally, really they under preformed on every front. Germany had always wanted Italy as an ally since they were another fascist dictatorship (hitler admired Mussolini) and on paper they were a strong military country with a modern army and navy that could threaten Britain in the Mediterranean. However, the Germans couldn't have known just how incompetent the Italians would be. They stumble from one loss to another and in they ended up hurting the German war effort.

I'm on mobile right now, but in a bit ill be back and post an older post I made, where I evaluated each campaign that Italians participated in.

Could you clarify your question? Like important as an ally, territory, etc.