You can remove, update, and refresh a Freeform 

Never delete the top-left data cell, as it holds the location of the Freeform report. Doing so doesn't remove it from the Excel sheet.

Select Use Remove Freeform report from the right-click menu to delete a Freeform report. This removes the report definition and leaves the cells as plain data values.

Alternatively, you can use Workbook objects in the More... menu of the Anaplan XL ribbon to locate or delete any Freeform report in the current workbook.

You can type over existing members in the sheet's rows, columns, or filters. You can also choose them from the Select Member dialog in the Anaplan XL > Pick member right-click menu or Freeform Report ribbon

If you want the data area to refresh after the dialog closes, select the Refresh report checkbox. 

When you change the members in rows, columns, or filters, you can click Anaplan XL > Refresh from the right-click menu or press CTRL+SHIFT+R to refresh the data area.