@Dukes:
Indeed! The nature of my question was this: Can you conduct combat (clear out the sea zone) and then move in with an amphibious assault. I suppose you must declare the units involved ahead of time?
Yes. You have to declare all combat simultaneously before any dice are rolled.
Typically, a land combat in the forums here looks like this, for example:
Fukien (1 defending inf)
2 inf, 1 fig FIC to Fukien
But, when I am posting my combat moves here and I am doing an amphibious assault I list the combats together like this using a possible J1 attack on the Philippines as an example:
sz50 (1 DD, 1 TP)+Philippines (2 inf)
1 BB, 2 TP w/ 3 inf, 1 art loaded in sz62 to sz50 unload Philippines after naval combat
1 DD sz51 to sz50
This indicates that the Japanese will be attacking the sz50 US DD(destroyer) with the sz62 Japanese BB(battleship)and the sz51 DD with the Philippines amphibious landing to occur after the US DD is sunk.
And you have to roll the sz50 naval combat first because there is a small chance that the US DD will sink both the Japanese BB and DD thus winning the battle and forcing the Japanese transports to retreat and abort the amphibious landing in the Philippines.