Not sure what you're asking but usually, start position is not on the KeySheet, it's in the message header. Depending on what procedure you're using, those trigramms can be a "check" to make sure you're using the right key or they can be...well... not used
I agree that the message header is normally where to look. But I recall a message here some time back where the fellow was doing some kind of geocaching puzzle. The kenngruppe held the trigraphs for the message key. I think we might be able to help if we also had the ciphertext to look at.
B123/AAA no stecker AAA ABC 1tle 1tle MHLS AYUW LFCE RQCY ESLI ERSD RDAL YCQY EJ