closing multiple years

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Hi Dear i hope everybody are fine on this period of time ,,, my question, because i am new user of Sage 50 and in our company we are working with the sage 50 premium Canadian version,,,, now thing`s i need,,,  how can i closing multiple year because the season date start in 01 01 2016 and our closing year end is Sep 31 first of each year and we were never closing the  sage 50 year end on time and now i am working with the sage and i try to update everything and do thing`s in right way but i can not closing the the previous year like for last 4 from 2016 till few days ago on Sep 31 2020 . Is there any of you guys can help on this issues.  thank you in advance