Hi @lisha,
Have you solved your problem?
Do you want to save multi selected items to data source?
Could you please tell me how you set the Items property of the Combo Box and what the column type of the column that you want to save the selected items to?
If the column you want to save the selected items to is a Choice type allowing multi select, you should set the Update property of the data card as below:
ComboBox.SelectedItems
However, if you want to save selected items to a Text column, and you set the Combo Box Items property as List.TextColumn(Here TextColumn is from another column), you should set the Update property of the data card as below:
Concat(ComboBox.SelectedItems,TextColumn,",")