Hi Andrew,
To save the values from the dropdown tags, on the "OnChange" event you need to save the CurrentList for a list that you will use to save the records. Ex: A list of the type of your Entity that relates the entity(Holiday) and the static entity(Country).
To show the saved values, you need to fill the attribute "SelectedItemsList" with a list that has the saved values. Ex: A list of the type of your Entity that relates the entity(Holiday) and the static entity(Country).
Is this what you want?
Best Regards,
Diogo Miguel