Thank you both so much! The link to the suggestion did help. In fact, I was able to set up the named tab range and insert it into the SUMIFS within the SUMPRODUCT formula. It produced a result!
However, I then tried to add one more criteria in the formula to lookup to the tab name within the named range based on the [@xxxxx] reference of my data set, but it produces a #VALUE.
In other words, instead of producing a value based on the SUMPRODUCTS of each specific cell within the name range, I was hoping the criteria I set in the SUMIFS would lookup to only 1 tab name instead of all 15.
Here's the example:
1) Each of 15 tabs has a metric name in B17. I17:V17 is the monthly data.
2) On each tab, I12:I12 is the date formatted as MMMMYY (January 2011)
3) The specific values in I17:V17 vary from tab to tab.
4) In my data table I have a SUMIFS formula that says, SUMIFS('TabNAme'!I17:V17,'TabNAme'!I12:V12,[@Date] (where the date matches the month)
This does work, but I want to make it dynamic enough that the tab name can change with the name in my data set (ie. [@TabName]. Furthermore, I want to be able to use the same formula but be able to change the sum range from I17:V17 to a dynamic range because I want to pull from other rows below as well.