Hi Walnut,
In Bu u just need to make a new online application.If u have any added work ex, or have improved ur past board scores,this past yr,..or u wish to add anything new to ur SOPs etc u may send tht..if not just go ahead and submit ur online application alongwith the application fees.
Infact, if u go thro BU's website u'll see tht they have mentioned this there already..Bu keeps ur file active for 1 year..So if u have applied last yr..then u follow wht I wrote above..If u applied more than an yr ago, then u will have to re-send all the documents again.U'll need new reccos ,SOP,etc..
Hope u got it.If you have any further doubts you shld contact BU by phone or try emailing Ms.Reed.Her email ID is also given on the website.
I guess there's a thread of this year's re applicants to BU, here on SDN .U might want to go thro' tht too. It will be of some help for sure.
Good Luck.
Hope to see you next fall as my classmate🙂👍