Calling a workflow from worksheet with the item id being modified?

Hi All,

   We have a requirement to call a custom procedure when users modify the data in a demantra worksheet. I see that there is already a standard workflow 'Update Data' which is executed whenever you save the data into database after doing the modifications in worksheet. Similarly we would need to call our custom procedure to identify all the items that are being modified and update the related items accordingly.

For e.g.: we have item A, B and C. In a custom table we maintain the relationship among items A,B,and C. So when a user modify the series 's1' for item A in worksheet and saves it, we would have to modify the same series 's1' for the items B and C.