Powerbi desktop

hi OguzMavice, many thanks for your response. The issue i am experiencing is not just removing a column, the current layout of the existing report has the following columns, trigger meant 1 = 3 months, trigger met 2 = 6 months, trigger met 3 = 9 months, trigger met 4 = 12 months. trigger met 5 = 15 months. The trigger met criteria has now changed, and i now need to replace my data source to remove trigger met 5 completely and also replaced trigger met 4 to 15 months. I have set this up in my data set source data, however, i am not sure on how to replace this on POWERBI without breaking the report.

I also have another issue which is seperate from the above, all our current reports that is designed as dataset and report is no longer showing as dataset, instead this now show as semantic model. And the reports are now showing errors with message that some colums does not exist in the rowset. This report has refreshed as expected all this time and no changes has been applied for it to break, the only pattern i can see has changed is the data set changed to semantic model. Please any idea how to fix this? and also to change the report back to data set setting? 

many thanks in advance.