I am in a partnership that changed members part-way through the year. Do I enter different fiscal period for each T2125 or write dates in the name (ie. *name* Jan1-May9)?

My business started 2018 with 3 individual partners, one partner stepped down in May 2018 leaving 2 partners until the end of the year. In a recent consultation with a CA, I was told that we could file two separate T2125's for each portion of the year. I am wondering if we should write the dates indicating each portion (Jan-May, May-Dec) in the name of the business (ie. *Name* (Jan1-May9)) or if I should enter a different Fiscal Period for each T2125?