Each slice is limited to ingredients from a single data table. But you can use multiple data tables within the same story.
When configuring a chart in an app with multiple data tables, you select the data table to use for the chart.
Select the data table to use for each chart
If you do use multiple data tables within a story, please note that filtering between slices using different data tables will only work for ingredients having the same ingredient id in each data table. To see the ingredient id for a particular ingredient, open the ingredient editor, click the gear icon, select Copy ingredient id, and paste it somewhere. If the ingredient ids do not match across multiple data tables, reach out to us.