My wife and I am on EAD and also both have H1B (I am in my 8th year of H1B and wife is in 5th year as teacher). Our EAD is based upon my job in EB3 category in IT as System Analyst/Administrator, my priority date Aug'2003. Last year I have completed MBA in Finance and can now work as a Project manager within the same company. Can I change my title to Project Manager or IT Manager and also can I change my profile now to work in Investment Company or any other non-IT field in the same company I am already working. As these delay of getting green card are actually causing problem in my career.
If you change your field/job description, it is very likely that you have to start your green card all over again. You should be able to carry the same priority date, but the PERM/I-140 may have to be done again.