Partial confirmation of Transfer order

Hi

I have created PO with 10qty...during GR, am posting all 10qty....so TR and TO gets created automatically as per our settings. but during TO confirmation, i have confirmed only 4 qty to that BIN (the one already mentioned in TO) in LT12...so i have 6qty difference....i would like to post the remaining 6qty, please guide me how do we do in this case

Note: when i try to confirm the same TO in LT12, system is saying that TO is already confirmed or cancelled message.....please let me know remaining qty how do post it here

Senthil