Form Help/Advice

[nottoolate]

Hello,

 

**I'm assuming I would use Ajax for this, but if this isn't the correct section please move.

 

I have a form in place that allows user to set up a job and submit it to whomever. The form also allows the user to enter a known parent job number and displays relevant information about the job number in the form fields below.

 

Once the parent job number is entered, a drop down appears that contains all the child jobs under the parent job.

 

What I need advice/help with:

 

I would like for the user to be able to enter the parent job number, select a child job from the drop down and the rest of the form below switches pages providing the user with information for the selected child job.

Is there a name for this feature? Or perhaps someone could point me towards a tutorial of some sort...

 

Thanks!