Enigma, you should post your question in the "SM movie tutorials" forum. You're more likely to get a response there than in the middle of a totally separate thread.

That being said, If you're making a hand using sub-ds, you shouldn't be attaching fingers at all. All you do is, in poly proxy mode, use the split polygon tutorial to create the spaces between the fingers then extrude each finger 3 times to create joints. Then tweak. Everything should be made from one object. If you don't understand, hit F1 on your keyboard and read up on the sub-d section of maya's manual. They walk you thorugh the entire process of creating a sub-d hand there as well.