The Items property of the combo box should contain the possible values for the practice in your app. For example, this could be one example:
["Sales Operation", "Digital Transformation", "Operational Excellence", "Inc. Inovation"]
If you are using this combo box inside a data card on a form, then the card's Default property should have the value from the Excel spreadsheet, so you would use this expression for the combo box DefaultSelectedItems property:
RenameColumns(Split(Parent.Default, ","), "Result", "Value")
This expression first splits the value from Excel in the multiple practices, then renames the resulting column so that the schema matches the one from the Items property (the function Split returns a table with a column called 'Result'; in the example above, my Items property has a column called 'Value').
Finally, you would need to change the Update property of the data card that holds the combo box control so that it will use the information from that control when writing back to the Excel table:
Concat(ComboBox1.SelectedItems, Value, ",")
Again, in my example, the property from the Items collection is in a column named 'Value', but it may be different in your case.
Hope this helps!
