Add Search Term To Form?

I have been working with different codes to get a search form working with a database.I have a search form based on drop down option values, what I would like to do is select a "company" and append the search term to the company's value.E.G the form would be something like:

<option value="http://url?term=valueisfromsearch&folder=Company Name">Company</option>

There will be a free text area which will allow users to input their search term but need this go feed into the above value of "valueisfromsearch". Upon submit, the user will be presented with their results in their browser.Is this possible mid-URL? I've seen info on Javascript Query String Parameters but don't really understand it that well.