I could use some help as I am not savvy with formulas. I have this long formula that references another sheet to calculate production credit by "assessors." This formula works fine and it calculates the entire sheet. I currently use this formula to calculate annual production credit.
=SUMIF({Production Credits_Sheet2 Lead Coach}, Assessor1, {Production Credits_Sheet2 Lead Coach$}) + SUMIF({Production Credits_Sheet2 Inbox}, Assessor1, {Production Credits_Sheet2 Inbox$}) + SUMIF({Production Credits_Sheet2 Direct Report}, Assessor1, {Production Credits_Sheet2 Direct Report$}) + SUMIF({Production Credits_Sheet2 TeamMeetingScorer}, Assessor1, {Production Credits_Sheet2 TeamMeetingS$}) + SUMIF({Production Credits_Sheet2 TeamMeetingNonScorer}, Assessor1, {Production Credits_Sheet2 TeamMeetingNS$}) + SUMIF({Production Credits_Sheet2 LeaderMeeting}, Assessor1, {Production Credits_Sheet2 LeaderMeeting$}) + SUMIF({Production Credits_Sheet2 InterviewWriteUp}, Assessor1, {Production Credits_Sheet2 InterviewWriteUp$}) + SUMIF({Production Credits_Sheet2 ReportWriting}, Assessor1, {Production Credits_Sheet2 ReportWriting$}) + SUMIF({Production Credits_Sheet2 DevSugg}, Assessor1, {Production Credits_Sheet2 DevSugg$})
However, I would like to add to the formula to calculate just for the month of January, then February, etc...