How to configure selection of booking resources (booking forms) using select box at one page and showing selected booking form then? (Available only at paid versions)

This customizations is available for the versions 4.0.2 or older.
Inside of the versions 4.1 or newer you can use the special shortcode for the insertion of the booking resource selections into the page or post. Please read more how to insert and configure the booking shortcode into the post or page here.

Firstly you need to open file of your actual theme, where you want to show this selection (For example: if you want to show it at pages, so then you need t open page.php file).
Then you need to add to specific place of this file next code:

<?php if ( strpos($_SERVER['REQUEST_URI'],'/bookingpage/') !==false ) { ?>
<label for="calendar_type">Type of booking:</label>
<select name="active_booking_form" onchange="jQuery('.bk_forms').css('display', 'none');
document.getElementById(this.value).style.display='block';" >
    <option selected="selected" value="select">Please Select</option>
    <?php global $wpdb;
    $types_list = $wpdb->get_results( "SELECT booking_type_id as id, title FROM ".$wpdb->prefix ."bookingtypes" );
    foreach ($types_list as $tl) { ?>
        <option value="<?php echo $tl->id; ?>"><?php echo $tl->title; ?></option>
    <?php } ?>
<p><?php foreach ($types_list as $tl) { ?>
<div class="bk_forms" id="<?php echo $tl->id; ?>" style="display: none;"><?php do_action('wpdev_bk_add_form', $tl->id, 1); ?></div>
<?php } ?>
<?php } ?>

At this example, this line

<?php if ( strpos($_SERVER['REQUEST_URI'],'/bookingpage/') !==false ) { ?>

is condition to showing the selection of form only at the specific page. In this case its page, which have term in URL, like this: 'bookingpage'

You can check this example at this page.