Web app: How can I make a web app input form post directly to a sub category

Question

Please, how can I go about this? Some of the ideas coming to my head is to  replace the section I require with the  generated webapp input form code with this:
<input type="radio" name="CAT_Category" value="{module_category, ID} onclick="javascript: return false;" >2013 /> // Not tested because am not sure of the markup
Am I on point ? Or is there any other way I can get this done.

Answer 1

I Trickster, pardon me if am not clear enough. But this is it. I have many BC Categories setup for different web apps. If you use the module {module_categorylist} only. BC will populate all the categories on the BC site, instead of a specific category  relevant to the web app. If it is {module_categorylist, categoryID}, you are telling BC to use the the categories in a specific category.
When you say that you want to assign a web app item to a sub-category... do you mean the built in BC categories . I want to do this via the web app input form not through the admin.
Do you have a top-level category that contains all the relevant sub categories that the user could use to classify/categorize the web app item upon submission?  Yea I have a top category that the user could use. It is this top-level category ID, I have used with the categorylist module.
If you don't want the user to choose the sub-category themselves, how do you plan to derive the sub-category anyway? Thanks again Trickster. You have provided the solution to that with the hidden input field code you shared earlier. The sub-category has been pre setup as usual in BC and the sub-category ID would be used as you instructed in the code. This is intended for another web app that won't require users selecting a category. This is the example you shared:
<input type="hidden" name="CAT_Category" value="my category ID"/>
Using my example above I was able to test and have it working (using {module_categorylist} with the SELECT element) on a web app input form and when I submitted the new web app item it was classified in the category I chose. Yes Trickster, it works for me too that way. the web app item was classified perfectly, but if you go to your the web app item submitted at the admin-end, you will discover in that the category the user selected in the front-end is not selected, even though the item was classified
I have highlighted it here: http://screencast.com/t/dwiXzBFXp
The option selected  by the user is not captured. It often defaults to the 2012, even when the user selected 2013 and the item has been classified as 2013.
I hope am more clearer. Thanks for all the effort.