Make Google Spreadsheet Formula Repeat Infinitely helped me to expand my formula indefinitely and other StackExchange results helped me get to here:
=ARRAYFORMULA(IF((AF2:AF="")," ","L"&ROW(F2:F)&":AD"&ROW(F2:F)))
However, when I tell "L"&ROW(F2:F)&":AD"&ROW(F2:F) to CONCATENATE, every row gives a results as if it was CONCATENATE(L2:AD2).
I tried =ARRAYFORMULA(IF((AF2:AF="")," ",CONCATENATE("L"&ROW(F2:F)&":AD"&ROW(F2:F)))) and =ARRAYFORMULA(IF((AF2:AF="")," ",CONCATENATE(INDIRECT("L"&ROW(F2:F)&":AD"&ROW(F2:F))))) but neither are working.
I am trying to get each row to CONCATENATE(L2:AD2) then CONCATENATE(L3:AD3) then L4:AD4 and so on.
Any help is most appreciated.