Need help in writing UDF?

Hello All,

In one XML iam getting multiple item level, i need to check each item level if the item level one tag contain i A, B, C and D then i need to add the amount of that particular item level , in the same way if the item tag is E , F and G then add that amount and send it to receiver side.

Please let me know how to do this.

Thanks and Regards,

Chinna