This is one more feature of ALV Which is shown here in ALV in Wendynpro as Totals and Subtotals Calculations.

Scenario: To create a dynamic ALV based on a SFLIGHT context node in Web Dynpro for ABAP and Display the TOTALS and SUBTOTALS in it.
This is a Webdynpro Application Explaining the Calculation of Totals in ALV Webdynpro.
First of all create a webdynpro application and introduce the alv component in the Used Component.

Now in the Component Usages add the component used...

Now in the Main window include the components in the Properties ...

Now create the node and its attribute.

Do the mapping of the node to the Data.Take Care for the Cardinality b'coz if the Cardinality is not proper it gives a runtime error for cardinality.

Now in the Layout Create the View Container in Which the ALV will be displayed.

Now in the Methods tab in the WDDOINIT do the coding for the ALV.
First Binding the Data to the ALV Table and then instantiating the ALV and then Coding to display the Total in ALV.

Read the Node as above and then code.....
DATA lo_nd_sflight TYPE REF TO if_wd_context_node.
   DATA lo_el_sflight TYPE REF TO if_wd_context_element.
   DATA ls_sflight    TYPE        wd_this->elements_sflight.
data:
  lr_comp_alv    type ref to if_wd_component_usage,
  lr_comp_if_alv type ref to iwci_salv_wd_table,
  lr_config      type ref to cl_salv_wd_config_table.
  data: lr_column_settings type ref to if_salv_wd_column_settings,
        lr_column          type ref to cl_salv_wd_column,
        lr_column_header type ref to cl_salv_wd_column_header.
  data : lt_column type salv_wd_t_column_ref,
         ls_column type salv_wd_s_column_ref.
  data:  lr_field_amnt type ref to cl_salv_wd_field.
  data: lv_aggr_rule   type ref to cl_salv_wd_aggr_rule.
  data: lr_sort_rule   type ref to cl_salv_wd_sort_rule.
data fs_flight      like line of ls_sflight.
*     navigate from <CONTEXT> to <SFLIGHT> via lead selection
  lo_nd_sflight = wd_context->get_child_node( name = 'SFLIGHT' ).
*& Fetch flight  data from database table
  select mandt
         carrid
         connid
         fldate
         price
         currency
         planetype
         seatsmax
         seatsocc
    from sflight
    into corresponding fields
    of   table ls_sflight.
  call method lo_nd_sflight->bind_table( ls_sflight ).
*... ALV Component Usage
  lr_comp_alv = wd_this->wd_cpuse_alv_test2( ).
  if lr_comp_alv->has_active_component( ) is initial.
    lr_comp_alv->create_component( ).
  endif.
  lr_comp_if_alv = wd_this->wd_cpifc_alv_test2( ).
*... Configure ALV
  lr_config = lr_comp_if_alv->get_model( ).
call method lr_config->if_salv_wd_table_settings~set_selection_mode
    exporting
      value = cl_wd_table=>e_selection_mode-multi_no_lead.
*... ALV Component Usage
  lr_comp_alv = wd_this->wd_cpuse_alv_test2( ).
  if lr_comp_alv->has_active_component( ) is initial.
    lr_comp_alv->create_component( ).
  endif.
  lr_comp_if_alv = wd_this->wd_cpifc_alv_test2( ).
*... Configure ALV
wd_this->lr_config = lr_comp_if_alv->get_model( ).
* display columns in correct order
  lr_column_settings ?= wd_this->lr_config.
  lt_column = lr_column_settings->get_columns( ).

loop at lt_column into ls_column.
    case ls_column-id.
      when 'PRICE'.
* aggregate field
        call method lr_config->if_salv_wd_field_settings~get_field
          exporting
            fieldname = 'PRICE'
          receiving
            value     = lr_field_amnt.
* create aggregate rule as total
        call method lr_field_amnt->if_salv_wd_aggr~create_aggr_rule
          exporting
            aggregation_type = if_salv_wd_c_aggregation=>aggrtype_total
          receiving
            value            = lv_aggr_rule.
    endcase.
endloop.
endmethod.

Now, in the Window add the View Container and the ALV Table in it.