Rule1:
------
Inputs:

items - AnyType
index - Number(Integer)
itemsToken - AnyType

Code:
----
a!gridRowLayout(
  id: ri!index,
  contents: {
    a!floatingPointField(
      label: "Total Amount incl GST ($)" & ri!index,
      value: ri!items[ri!index].amountInGst,
      saveInto: ri!items[ri!index].amountInGst
    ),
    a!imageField(
      label: "delete " & ri!index,
      images: a!documentImage(
        document: a!iconIndicator(
          "REMOVE"
        ),
        altText: "Remove",
        caption: "Remove ",
        link: a!dynamicLink(
          value: ri!index,
          saveInto: {
            a!save(
              ri!items,
              remove(
                ri!items,
                save!value
              )
            ),
            a!save(
              ri!itemsToken,
              append(
                ri!itemsToken,
                save!value
              )
            )
          }
        )
      ),
      size: "ICON"
    )
  }
)