Thread

<form method="post" action="#">
TYPE

<select name="types">
<option value="">Select All</option>
<option value="Type 1">Type 1</option>
<option value="Type 2">Type 2</option>
</select>

LOCATION

<select name="locations">
<option value="">Select All</option>
<option value="Urban">Urban</option>
<option value="Rural">Rural</option>
</select>

BEDROOMS

<select name="bedrooms">
<option value="">Select All</option>
<option value="1">1</option>
<option value="2">2</option>
</select>

<input type="submit" src="/images/interface/submit.gif" border="0" alt="Submit">
</form>

{exp:channel:entries channel="property" search:house_type="{embed:types}" search:house_location="{embed:locations}" search:house_bed="{embed:bedrooms}"}
{title}

{/exp:channel:entries}

<?php // Set up POST variables:
if( isset($_POST['name_of_course']) ) { $course_name_select=$_POST['name_of_course']; } else { $course_name_select="all"; }

if( isset($_POST['location']) ) { $location_select=$_POST['location']; } else { $location_select="all"; }

?>

<form>
...
</form>

{!-- CALL THE SUB-TEMPLATE --}
{embed="includes/_my_table_output" name_of_course="<?php if($course_name_select !== "all") {echo $course_name_select;} ?>" location="<?php if($location_select !== "all") {echo $location_select;} ?>"}

{exp:channel:entries channel="courses" dynamic="off" orderby="date_of_session" sort="asc" search:training_session_location="{embed:location}" search:course_name="{embed:name_of_course}"}