There's also 2 buttons you should look at when you import a portfolio to RW.
The first will show you a statblock of the portfolio. That's a great way to see what the portfolio contains without opening HL. Also, if it's like 2 goblins or something, you can quickly and easily see what their stats are, what the combat moral is, tactics, and items that they have on them after their eventual defeat. Simple, easy table of what's in the portfolio. Great way to get it done quickly.
The second button will IMPORT the portfolio into an already opened HL session. So if you have your players opened in HL and you import the encounter portfolio, you can use all the nifty tools in HL like initiative tracker, power descriptions, add/remove effects like bless or rage or mage armor, things like that. You can see that the Wizard you've imported has a Magic Missile spell that does 2D4+5 or whatever. VERY useful.
But the best part of importing, IMHO, is when the party says, "I want that sword," or, "I'll take that armor," or my favorite, "I'll put on the [cursed] amulet the necromancer was wearing," you can EASILY click the item container button in HL and choose "give to hero...." to divvy up party loot without having to go back later and reinput stuff over and over again. BIG time saver.
You can also open HL from RW with the import (I think) if you don't have it open already. It's pretty nifty.
VERY useful for when you don't have your party in HL, but there's conditions on the encounter like, "If the alarm went off in room B4 the guards from B7 will join the fight in this room as well." So you'd open HL with the guards in the room you're in, go to the B7 topic, and add them to the fray.
The HL snippet is the best part of RW if you use HL at all in your game. It's awesome.