Calculating Year To Date Figures

Hi I am new to Knime and hoping someone with more knowledge may be able to point me in the right direction please?

I have an excel spreadsheet as the main input. This holds financial data for the current Financial year and is updated monthly (month end results) by project. I would like to create a workflow that ‘knows’ what the current month is and produces a year to date figure for plan vs latest views vs actuals for each project that can then be totalled later on. The plan will have data in for every month during the year from month 1 (as may the LV but this is updated monthly looking forward). I need to be able to show what the accumulated values are for plan, LV and actuals from month 1 to current month and as the new excel file is uploaded each month, the workflow recognises the current month and sums up the values from month 1 to current month for plan, LV and actuals.

Any help would be greatly appreciated - thank you