Select Case or if statement to override particular values
My company recently moved to Qlik Sense. Due to some nuances in the data and an inability to capture past 'snapshots' I have 13 months of previous data that Qlik can't report accurately. I've been trying to set up a select case or if statement to the tune of
Count( [expression Qlik can use for current and future])
))))
Both select case and if statement attempts result in '-' across all data points and end up showing dates as far back as May-2017. The Count expression contains "[Cdate] = {'>=$(=Date(MonthStart(AddMonths(Now(), -13))))'}" so I should only get 13 months.
Is there a way to shoehorn data into the charts like this, plus have it drop off so I don't have to delete a line each month (next month I don't want to see 'Jan-2018')?