InfoPath Dev

I might be going down a very long and endless path here, but I am determined to get some type of filter ability in browser forms. I have a list of Bus Routes that only run on certain days. These bus routes populate a drop-down control in an Infopath form. I would like for users to be able to select a day of the week and then only see bus routes ...

I have a drop-down list box control in a form. This control retrieves a list of bus routes from a SharePoint list. The drop-down contains items like "Monday A1 am" and "Sunday B2 pm." This list is very long. What I would like to do is filter this data so if the user selects a date from a datepicker it will only display ...

 I've created a date picker object in infopath. When I preview the form the date picker works just fine. However, when I publish the form to my sharepoint site the date picker box is gone, and I am left with only a textbox. Is this a configuration issue or is there something wrong here?   Thanks

This has probably been answered in some form on this forum, but I have a specific method in mind.  I have a dropdown box that gets its data from a sharepoint list. For example it pulls a list of bus routes, and the user selects one. Below that are a series of text boxes for information such as Clock In, Clock Out, Depart, etc. All of this ...