This may be a stupid question but i have asked a few guys tonight at work that where flying jets and couldnt help me. Since i didnt have a FAR/AIM with me or with me where i am right now i thought i would ask here. Simple question i dont know...If you have your single engine commercial in hand, then go for your mulit-engine rating with instrument add on do you have to do anything different or go for another check ride for a multi commercial, or does it just carry over from your single engine commercial? Thanks for any info.