@joneiseman I think I found part of the code used but not sure where to go with it.
<div class="trigger-context trigger-context-event">
<div class="em-automation-context-multi em-automation-event-categories">
<?php
$what = isset($trigger->trigger_data['filters']['categories_include']) ? $trigger->trigger_data['filters']['categories_include'] :'include';
?>
<p>
<label>
<select name="trigger_output[events][categories_include]" class="em-automation-event-categories-include">
<option value="include" <?php if( $what === 'include' ) echo 'selected'; ?>><?php esc_html_e('Include', 'em-pro'); ?></option>
<option value="exclude"<?php if( $what === 'exclude' ) echo 'selected'; ?>><?php esc_html_e('Exclude', 'em-pro'); ?></option>
</select>
<strong><?php esc_html_e('the following categories:', 'em-pro'); ?></strong>
</label>
</p>
<p>
<label for="em-automation-event-categories" class="screen-reader-text"><?php esc_html_e_emp('Event Categories'); ?></label>
<select name="trigger_output[events][categories][]" class="em-selectize checkboxes" id="em-automation-event-categories" multiple size="10" placeholder="<?php esc_html_e_emp('Event Categories'); ?>">
<?php
$args_em = apply_filters('em_automation_categories_args', array('orderby'=>'name','hide_empty'=>0));
$categories = \EM_Categories::get($args_em);
$selected = !empty($trigger->trigger_data['filters']['categories']) ? $trigger->trigger_data['filters']['categories'] : array();
if( !empty($args['category']) ){
if( !is_array($args['category']) ){
$selected = explode(',', $args['category']);
} else {
$selected = $args['category'];
}
}
$walker = new \EM_Walker_CategoryMultiselect();
$args_em = apply_filters('em_automation_categories_walker_args', array('hide_empty' => 0, 'orderby' => 'name', 'name' => 'category', 'hierarchical' => true, 'taxonomy' => EM_TAXONOMY_CATEGORY, 'selected' => $selected, 'show_option_none' => esc_html__emp('Event Categories'), 'option_none_value' => 0, 'walker' => $walker,));
echo walk_category_dropdown_tree($categories, 0, $args_em);
?>
</select>
</p>
</div>
