Occasionally I help residency applicants who are applying in two specialties. This tactic can be strategic in specific scenarios, but it also makes the process more complicated. Here are some quick clarifications to help:
1) Different personal statements can be assigned to different programs. This means you can assign your ob/gyn essay to ob/gyn programs and your internal medicine essay to internal medicine residencies. Of course, in this case, you need to have two versions of your statement in the first place, and you need to ensure you assign correctly.2) Different letters of recommendation can be assigned to different residency programs as well. (A maximum of four letters may be assigned to each program.) You'll either need to have letter writers for different fields, letter writers who will craft two types of letters, generic letters (less compelling), or a mix of these approaches.
3) You will have only one MyEras application. It will go to all of your programs. Note that if you list your membership in multiple ob/gyn organizations, for example, that will be viewed by your internal medicine readers as well - and might make them question your commitment to IM.
Contact me for help.