Hi @RandyHayes
This is the items property of the parent gallery:
SortByColumns(Filter(FormQuestions_VW, Id = Value(ddlForm.Selected.Id) && ParentId = 0 ), "Order")
This is the items property of the child gallery:
SortByColumns(Filter(FormQuestions_VW, ParentId = ThisItem.FormQuestionId ), "Order")

ddlForm refers to the drop down list where the user select the type of form he wants to fill out, according to the selected form, the questions will change.