In A section We have added a Select Item dropdown and Checked Items read only text input filed.
On click dropdown it will launch a local action in overlay and inside the overlay configured a repeating dynamic layout with data page. The section included in the repeating dynamic layout hold 2 things,
1) a check box property to capture multiple selection
2) value of the selected item.
when ever user select a dropdown and select multiple check boxes. On each selection of checkbox selected value has to show in comma separated in the checked items read only field.
Please find the attachments
***Edited by Moderator Marissa to change type from Pega Academy to Product; update capability tags***