안녕하세요~^^

1차 카테고리에 대한 2차 카테고리,

2차 카테고리에 대한 3차 카테고리는 아래의 코드를 사이트에 맞게 수정하여 사용해보세요.

<?php if($board->use_category == 'yes'):?>

<?php
// 이 부분의 코드를 적절히 수정해주세요.
$category2 = array(
	'이케아' => array('책상2', '책상2-1'),
	'일룸' => array('의자2', '의자2-1'),
	'현대리바트' => array('칠판2', '칠판2-1'),
	'카' => array('연필2', '연필2-1'),
);

$category3 = array(
	'책상2' => array('책상3', '책상3-1'),
	'의자2' => array('의자3'),
	'칠판2' => array('칠판3'),
	'연필2' => array('연필3'),
);
?>

<!-- 카테고리 시작 -->
<div class="kboard-category category-mobile">
	<form id="kboard-category-form-<?php echo $board->id?>" method="get" action="<?php echo $url->toString()?>">
		<?php echo $url->set('pageid', '1')->set('category1', '')->set('category2', '')->set('target', '')->set('keyword', '')->set('mod', 'list')->toInput()?>
		
		<?php if($board->initCategory1()):?>
			<select name="category1" onchange="jQuery('#kboard-category-form-<?php echo $board->id?>').submit();">
				<option value=""><?php echo __('All', 'kboard')?></option>
				<?php while($board->hasNextCategory()):?>
				<option value="<?php echo $board->currentCategory()?>"<?php if(kboard_category1() == $board->currentCategory()):?> selected<?php endif?>><?php echo $board->currentCategory()?></option>
				<?php endwhile?>
			</select>
		<?php endif?>
		
		<?php if(kboard_category1() && $category2):?>
			<select name="category2" onchange="jQuery('#kboard-category-form-<?php echo $board->id?>').submit();">
				<option value=""><?php echo __('All', 'kboard')?></option>
				<?php foreach($category2[kboard_category1()] as $category2_name):?>
				<option value="<?php echo $category2_name?>"<?php if(kboard_category2() == $category2_name):?> selected<?php endif?>><?php echo $category2_name?></option>
				<?php endforeach?>
			</select>
		<?php endif?>
	</form>
</div>

<div class="kboard-category category-pc">
	<?php if($board->initCategory1()):?>
		<ul class="kboard-category-list">
			<li<?php if(!kboard_category1()):?> class="kboard-category-selected"<?php endif?>><a href="<?php echo $url->set('category1', '')->set('category2', '')->set('pageid', '1')->set('target', '')->set('keyword', '')->set('mod', 'list')->tostring()?>"><?php echo __('All', 'kboard')?></a></li>
			<?php while($board->hasNextCategory()):?>
			<li<?php if(kboard_category1() == $board->currentCategory()):?> class="kboard-category-selected"<?php endif?>>
				<a href="<?php echo $url->set('category1', $board->currentCategory())->set('category2', '')->set('pageid', '1')->set('target', '')->set('keyword', '')->set('mod', 'list')->toString()?>"><?php echo $board->currentCategory()?></a>
			</li>
			<?php endwhile?>
		</ul>
	<?php endif?>
	
	<?php if(kboard_category1() && $category2 && isset($category2[kboard_category1()]) && $category2[kboard_category1()]):?>
		<ul class="kboard-category-list">
			<li<?php if(!kboard_category2()):?> class="kboard-category-selected"<?php endif?>><a href="<?php echo $url->set('category2', '')->set('pageid', '1')->set('target', '')->set('keyword', '')->set('mod', 'list')->tostring()?>"><?php echo __('All', 'kboard')?></a></li>
			<?php foreach($category2[kboard_category1()] as $category2_name):?>
			<li<?php if(kboard_category2() == $category2_name):?> class="kboard-category-selected"<?php endif?>>
				<a href="<?php echo $url->set('category2', $category2_name)->set('pageid', '1')->set('target', '')->set('keyword', '')->set('mod', 'list')->toString()?>"><?php echo $category2_name?></a>
			</li>
			<?php endforeach?>
		</ul>
	<?php endif?>
	
	<?php if(kboard_category2() && $category3 && isset($category3[kboard_category2()]) && $category3[kboard_category2()]):?>
		<ul class="kboard-category-list">
			<li<?php if(!kboard_keyword()):?> class="kboard-category-selected"<?php endif?>><a href="<?php echo $url->set('category3', '')->set('pageid', '1')->set('target', '')->set('keyword', '')->set('mod', 'list')->tostring()?>"><?php echo __('All', 'kboard')?></a></li>
			<?php foreach($category3[kboard_category2()] as $category3_name):?>
			<li<?php if(kboard_target() == 'kboard_option_category3' && kboard_keyword() == $category3_name):?> class="kboard-category-selected"<?php endif?>>
				<a href="<?php echo $url->set('target', 'kboard_option_category3')->set('keyword', $category3_name)->set('pageid', '1')->set('compare', '=')->set('mod', 'list')->toString()?>"><?php echo $category3_name?></a>
			</li>
			<?php endforeach?>
		</ul>
	<?php endif?>
</div>
<!-- 카테고리 끝 -->
<?php endif?>

위 코드에서

$category2 = array(
    '이케아' => array('책상2', '책상2-1'),
    '일룸' => array('의자2', '의자2-1'),
    '현대리바트' => array('칠판2', '칠판2-1'),
    '카' => array('연필2', '연필2-1'),
);

이 부분의 '이케아', '일룸', '현대리바트', '카'는 워드프레스 관리자 -> KBoard -> 게시판 목록 -> 게시판 선택 -> 기본설정 페이지에서

설정한 1차 카테고리입니다.

책상2, 책상2-1은 이케아에 대한 2차 카테고리가 됩니다.

$category3 = array(
    '책상2' => array('책상3', '책상3-1'),
    '의자2' => array('의자3'),
    '칠판2' => array('칠판3'),
    '연필2' => array('연필3'),
);

이 부분의 '책상2', '의자2', '칠판2', '연필2'는

$category2 = array(
    '이케아' => array('책상2', '책상2-1'),
    '일룸' => array('의자2', '의자2-1'),
    '현대리바트' => array('칠판2', '칠판2-1'),
    '카' => array('연필2', '연필2-1'),
);

2차 카테고리로 설정한 카테고리입니다.

책상3, 책상3-1은 책상2에 대한 3차 카테고리가 됩니다.

최종적으로 이케아는 1차 카테고리, 책상2, 책상2-1은 2차 카테고리, 책상3, 책상3-1은 3차 카테고리가 됩니다.

추가적으로 editor.php 파일에 아래의 코드를 추가해보세요.

<div class="kboard-attr-row">
	<label class="attr-name"><?php echo __('Category', 'kboard')?>3</label>
	<div class="attr-value">
		<select name="kboard_option_category3">
			<option value=""><?php echo __('Category', 'kboard')?> <?php echo __('Select', 'kboard')?></option>
			<option value="책상3"<?php if($content->option->category3 == '책상3'):?> selected<?php endif?>>책상3</option>
			<option value="책상3-1"<?php if($content->option->category3 == '책상3-1'):?> selected<?php endif?>>책상3-1</option>
		</select>
	</div>
</div>

페이지에 맞게 <option> 태그를 수정하거나 추가해주시면 됩니다.

고맙습니다.