Button Click Event with Selectable Grid in Kinetic 2022.1.13 Application Studio

Hello Epicor community, Application Studio newbie here hopefully you can offer some assistance. I am struggling with what one would think is a simple problem, I am in the process of trying to convert a custom screen we currently only have in classic view to the Application studio to prepare for migrating to cloud from on-prem. And doing this in our current version 2022.1.13 is proving to be a nightmare since many of the tools as well as wizards that I’ve found referenced in other posts do not appear to exist yet in the version we are running and there is no longer the ability to simply create custom code within App Studio.

This is a screenshot of where I’ve gotten so far for reference. It is essentially two panel cards that have the grids filled by two seperate BAQs. I have gotten as far as making both grids selectable, added the relevant buttons, etc. However the properly how to create the action onclick for the button is where I am getting lost.

So referencing the above photo, what I would like to do is whatever rows are selected within the grid when the Schedule button is clicked. It writes back to Job_Head.Date06 of each selected row, the value that is entered in the datepicker(DatePickerSchedule), and to Job_Head.Number01 the value that is entered in the textbox(TextBoxLoadNum).

I would assume this needs to be done by invoking a rest-erp call to the Erp.BO.JobEntrySvc UpdateExt but how to get the correct data including which rows are selected from the grid and the user filled textbox/datepicker into the service call is where I am stuck. Any guidance on this or a good solid past example of something similar I could reference would be very helpful as once I am over that hurdle of how this is accomplished the rest of what I am trying to do within this should fall into place.

Thanks in advance for any help you guys and gals can offer!