We have to fill the domicile in the form only, I dont think any editing is allowed in the already submitted form, still you can search on their official web site and post your query Domicile is not required for the 15% seats available i.e.all india quota.but this is a great relief when you are applying  underr state quota. As a candidate from  a different state has to compete against  the 85% seats available. They ask your domicile proofs at the time of councilling only. There are many other exams also at all India level like AFMC,BHU, JIPMER and Manipal etc. for these you have to fill the seperate forms