block custom main - <select>

-- HikaShop version -- : 2.3.4
-- Joomla version -- : 3.4.1

You can display the value of show_block_custom_main as <select> ?

<?php echo $this->fieldsClass->show($oneExtraField,$value); ?>

Now these are in series, we would like to derive as <select>

Still need to remove from the output values with a comma ","

For example:
Shoes sold. This Shoe 4 size: 25,26,27,32.
The buyer chooses the size of the Shoe from the display size. If done as you suggest, then there would be no communication. In the admin chose product specific values, and the front part of the site displays the field (25,26,27,32) and a combobox (25,26,27,28,29,30,31,32) not associated with a field .