Hi Manasa, if you are using a column with a filter such as ".base", the XFBR cannot read each individual column as you noticed. Only splitting each period up into a separate column in the CV builder will work - just as you described. Not sure what it is you want to achieve exactly, but I would just create a string in the XFBR that returns each period of the selected WF year that includes your desired modifications.
I.e. instead of using WFYear.base in the columns, you pass the WF year to the XFBR and then return a string, e.g. "2022M1, 2022M2, 2022M3" etc. And in this one you should have already worked in your modifications / conditions.