Excel after Catalina
I am using iMac from 2013 with MoJave and have not yet moved to Catalina because I am heavy user of excel 2011 and I understand that will no longer work after move to Catalina. I would prefer to use Numbers in future to replace what I do with excel but up to this time I have used Numbers only for relatively simple spreadsheets. I like to think that Numbers must be able to do most of what I use in Excel, but I am not certain. For example, I have an excel spreadsheet that uses the "DSUM" command. If I open this spreadsheet in Numbers it does not convert the formulas to any Numbers equivalent. But can anyone from the community tell me if there is a workaround within Numbers to accomplish what the DSUM command does in excel? Or should I just forget about Numbers and get Office 365 to keep using excel? Thanks for your help.
iMac 21.5", macOS 10.14