ri! 
hours, an array 

code: 
=load(
  /* Needed when adding or removing items via a!applyComponents `*/
  local!hoursToken,
  a!formLayout(
    label: "SAIL Example: Inline Editable Grid",
    firstColumnContents: {
      a!gridLayout(
        headerCells: {
          a!gridLayoutHeaderCell(label: "Project"),
          a!gridLayoutHeaderCell(label: "Role", align: "RIGHT"),
          a!gridLayoutHeaderCell(label: "Date", align: "RIGHT"),
          a!gridLayoutHeaderCell(label: "Hours", align: "RIGHT"),
          a!gridLayoutHeaderCell(label: "User", align: "RIGHT"),
          /* For the "Remove" column */
          a!gridLayoutHeaderCell(label: "")
        },
        /* Only needed when some columns need to be narrow */
        columnConfigs: {
          a!gridLayoutColumnConfig(width: "DISTRIBUTE"),
          a!gridLayoutColumnConfig(width: "DISTRIBUTE"),
          a!gridLayoutColumnConfig(width: "NARROW"),
          a!gridLayoutColumnConfig(width: "DISTRIBUTE"),
          a!gridLayoutColumnConfig(width: "DISTRIBUTE"),
          a!gridLayoutColumnConfig(width: "NARROW")
        },
        rows: a!applyComponents(
          function: rule!PX_LI_ucItemRowEach(
            hours: ri!hours,
            index: _,
            hoursToken: local!hoursToken
          ),
          array: if(or(isnull(ri!hours), count(ri!hours) < 1), {}, 1+enumerate(count(ri!hours))),
          arrayVariable: local!hoursToken
        )
      ),
      a!linkField(
        label: "Add Link",
        labelPosition: "COLLAPSED",
        links: a!dynamicLink(
          label: "+Add Item",
          /*
           * For your use case, set the value to a blank instance of your CDT using
           * the type constructor, e.g. type!PurchaseRequestItem(). Only specify the field
           * if you want to give it a default value e.g. due: today()+1.
           */
          value: {id: null, hours: null, date: null, user: null, role: null, project:null, status: null},
          saveInto: {
            a!save(ri!hours, append(ri!hours, save!value)),
            /*` When modifying the size of the array used in a!applyComponents, */
            /* make the same change in the "token" array variable   
            */
            a!save(local!hoursToken, append(local!hoursToken, save!value))
          }
        )
      )
    },
    buttons: a!buttonLayout(
      primaryButtons: a!buttonWidgetSubmit(
        label: "Submit"
      )
    )
  )
)