In our C#.Net application we are using QC OTA API for fetching/displaying/manipulating data from QC. For opening a defect, in our project, we have some user defined fields which are related to each other eg.: Application Name and Application ID. The fields are BG_USER_12 and BG_USER_REMPLATE_09 respectively. I am getting the possible values for these fields using Customization Lists. What I need now is the relation between the two, so that when a user selects one value for Application Name, the corresponding vale for Application ID will get selected automatically.

Please let me know how to get the relation between the two fields in C# .Net