How to pass the values of combo box options from one page to other page

I assume you're asking for multiple select boxes.
Use the php array notation for the name of the select box.

eg:

<select name="myselectbox[]" multiple="true">
<option value="0">Value 0</option>
<option value="1">Value 1</option>
</select>

Notice the name of the select box is myselectbox[].
This makes sure that the selected options are passed as an array to php.

You can use this notation for any form elements. Its required for multiple select boxes and multiple checkboxes.