Implement Total functionality for Form

Hi,

 I have form with header and line (just like salesTable or PurchTable). I have to add a total functionality for this form same like on saleTable form or PurchTable form i.e to display total qty, total Value etc..

  So my question is can I achieve it through view (and attach it to view) or do I need to implement same functionality like salesTotal or PurchTotal (create class for totaling and all)?

 pleas suggest simple & best approach