More info needed. A sample packaged workbook would be great.
Well, I have sales data across a time period, Time parameters for Start & End. Changing the parameters on a slider changes the data as per period.
However, I now have to add a YTD column which shouldn't change when time sliders are moved.
Well then duplicate your data source and use the new data source to display the column you want to remain constant, and the original data source for the other columns that change. Sorry this is such a generic answer, but without a sample workbook it's impossible to discern how your data is set up, pills arranged, type of chart, etc. Can you recreate your view using the Super Store data source? Or at the very least post a screenshot of the entire Tableau window with any sensitive data blacked out? Be sure to include all the whole window so we can see the pill arrangement/color and the number and type of data sources, etc. Thanks,