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[shortcode]
 [shortcode1 title="variable text"] Some text[/shortcode1]
 [shortcode1 title="variable text"] Some text[/shortcode1]
 [shortcode1 title="variable text"] Some text[/shortcode1]
 [shortcode1 title="variable text"] Some text[/shortcode1]
 [shortcode1 title="variable text"] Some text[/shortcode1]
 [shortcode1 title="variable text"] Some text[/shortcode1]
[/shortcode]

Based on the need for a shortcode an HTML parts needs to be repeated based on user/admin inputs. I have presented a format. Is the above a possibility?

Can a shortcode be published within a shortcode multiple times?

Further explanation of the situation Future reader may find it helpful→ This is the edifice of an HTML (Hypothetical example)

<div class="classone">
 <div class="classtwo"> 
 <div class="classthree">
 <ul class="four"> 
 <li class="question">
 <h3>Question</h3> 
 </li> 
 <li class="answer">
 <p>Answer</p> 
 </li> 
 </ul> 
 </div> 
 </div> 
</div>

This part is repetitive and Inner shortcode →

<li class="question">
 <h3>Question</h3> 
</li> 
<li class="answer">
 <h3>Question</h3> 
</li> 

I think the code for the external shortcode will be written like this →

function external_shortcode()
 ob_start();
 ?>
 <div class="classone">
 <div class="classtwo"> 
 <div class="classthree">
 <ul class="four"> 
 <!-- This is the place where I want the inner shortcode many time -->
 </ul> 
 </div> 
 </div> 
 </div>
 <?php 
 return ob_get_clean();

add_shortcode( 'shortcode', 'external_shortcode' );

Code for the Inner shortcode →

function internal_shortcode($atts, $content = null)
 $data = [
 'title' => 'Some heading text goes here.',
 ];
 $values = shortcode_atts($data, $atts);
 ob_start();
 ?>
 <li class="question">
 <h3><?php echo esc_attr($values['title']); ?></h3> 
 </li> 
 <li class="answer">
 <p><?php echo $content; ?></p> 
 </li> 
 <?php 
 return ob_get_clean();

add_shortcode( 'shortcode1', 'internal_shortcode' );

Yes, you can include a shortcode however many times you like, inside a shortcode. Just make sure you set up the parent shortcode to parse shortcodes nested within.

So, for example, if your [shortcode] does something like

function outer_shortcode($content = null) 
 return '<div>' . $content . '</div>';

just be sure to update it to parse the content for other shortcodes:

function outer_shortcode($content = null) 
 return '<div>' . do_shortcode($content) . '</div>';

You can then nest however many duplicate shortcodes as you like inside.

Using @WebElaine's example, all you need is to add the do_shortcode($content) to your current code:

// use both parameters in your function declaration, even if you will ignore the $atts
function external_shortcode($atts, $content)
 ob_start();
 ?>
 <div class="classone">
 <div class="classtwo"> 
 <div class="classthree">
 <ul class="four">
 <?php
 // Using do_shortcode will cause Wordpress to output your inner shortcodes.
 do_shortcode($content);
 ?>
 </ul> 
 </div> 
 </div> 
 </div>
 <?php 
 return ob_get_clean();

add_shortcode( 'shortcode', 'external_shortcode' );