How to disrupt enemy supply convoy?

[jomni]

Before invading an island, I would like to cut off the enemy's supply so that the chances of success are improved.

So so what do I do to effectively disrupt the supply convoy? Can I form a blockade?
Which ship type and orders? Where to put them? How do I see if it's working?

I suppose putting ships and subs in the relevant sea area should do the trick. But what orders? Normal? Raid? Engage / Don't Engage? How do I see the results?

In my game as US, I still hold Wake. And I still get full supply each turn even if there are IJN TFs in the area invading and bombarding each turn. I do have some subs but they seem to don't want to attack at the moment. So my Wake force (which I upgraded to Corps... unrealistic but gotta do this to win right?) still hangs on because of the continuous supply. I fear that it will be the same case when I start the island hopping phase.

[doomtrader]

The most efficient way is to send your subs into sea zone adjacent to the port of destination, and set them into raider ode.

[jomni]

Ok will try that.  Do I see the results of my raid?
Would be nice if there's a blockade order for certain TFs where you can put them into an enemy controlled port but don't know if it will skew the game balance and make invasions too easy.

[doomtrader]

you can see the results in reports under raiders activity