Trying to display an intro text that is different for each variant

This should be quite easy I would have thought but I just cant seem to do this!

I could not get the default "read more" function to work , to divide the content into intro and main. IT just wont display even if I add the code
<?php if(!empty($this->element->extraData->topEnd)) { echo implode("\r\n", $this->element->extraData->topEnd); } ?>

So instead I added a custom field called "introduction". This is fine but when I displayed the field with

<?php echo $this->row->introduction; ?>

And this works but the field does not change with the variants.

So I checked the "normal" custom field display and the field does change with the variants (using show_block_custom_main.php).
The problem here is that it has a title "Specifications" and then the fields are listed in a table, with the field title and then the value.

I only have one custom field so I thought its ok, I can do an over-ride of show_block_custom_main.php and remove the title and the table markup.

This works, BUT for some reason when a variant is selected with options, the "sepcifications" title and the table come back. I cannot find where is coming from - I even modified the core file as well as my over-ride but I can't stop this.

This seems so hard to do such a simple thing. I hope there is an easy solution out there for me. I have checked hundreds of threads and read the documentation many times

Thanks.

Hi Jerome,

Sorry about that.

And thanks for pointing out the show.php file - that explains it for me

Cheers