How to get the values of only one row in a repeating group

Hello everyone, I have a repeating group and each row on it has a button and some elements with values, How to save only the values in one row by clicking on the button on the same row? without saving every values on the whole content of the repeating group. Thanks in advance!

As long as button is grouped within the RG, you can access/edit the values of that specific record in the RG.

Actually, the problem is that when I click on one of the book button, all the button is executed , However I want it to only work on the current row of the button

Share your workflow setup

What is the parent group data source and where is it located?

the parent group data source is the challenge user info, I just want to save the values on the same row of the book button to the Mentor data type