Custom WEBADI using API

 Hi

  I am building a custom WEBADI using CREATE_INTERFACE_FOR_API with the following requirement:

  Eg: I have 4 records in my base table with a column of percentages which has 40, 40, 10 and 10 for 4 records with a certain combination.

  Now an user wants to keep only two records with 50% each for the same combination, so here i need to update the 2 records as the combination is same through WEBADI, also i need  delete the other 2 records from my base table as they are not necessary.  

will i be able to achieve this using API methodololy? Please suggest me the way or the options to get my results.