I have a record lets say A thats a child of record Parent. I will create multiple reports for Parent from child record. Record list action should fetch the parent id from the child record where i am going to configure the record action field and that value should be passed as process model parameter
Discussion posts and replies are publicly visible
Record list actions are meant to create a new item of that record. If you want to create a new child record, I suggest to make that a record action on the parent.
The other option is to allow the user to pick a parent when creating the child.