Hi @keerthana k ,
As per your description, my understanding is that you want to pre-populate a text box field based on a multiple-selection field, right? If yes, please add rules like below to the multiple-selection field. For example:
If the multiple-selection field contains "1234", set the text field to vlaue concat("a@domian.com, ", [text box filed])
If the multiple-selection field contains "2345", set the text field to vlaue concat("b@domian.com, ", [text box filed])
If the multiple-selection field contains "6789", set the text field to vlaue concat("c@domian.com, ", [text box filed])
If the multiple-selection field contains "1657", set the text field to vlaue concat("d@domian.com, ", [text box filed])
...
Test reuslt on my end.
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