Hi
What you'll want to do is take your Baldur's gate I savegame and copy it over to your Baldur's gate II save folder (either single or multi will work) - Then go into the game and create a new character (choose import) and then select 'Saved Game'.. you should be able to choose the BGI save file that you copied over, select it and you'll see any PC characters you had in that save.
I think you can also just copy an exported BG I character directly to the BG II character folder and then import him, but i've never done it that way myself.
hope that helps!