PreOrder Module by Webkul

[AlexBr]

Hi everyone, 

I need some help. I'm using the preorder module by webkul, and it allows me to print something like this in the description :

     -  30% i.e  {preorderPrice} 
     - the remaining amount to be paid is  {originalPrice}  

 

But I don't want the originalPrice in the second line, I want the originalPrice - the preorder i tried {originalPrice}-{preorderPrice} or even {originalPrice - preorderPrice} but it's not working. 

I looked into the file preorder\controllers\admin\AdminNewPreorderController.php to add some modification, but i'm clearly lost. 

So i tried harder searchin' on Google without any results. If one of you guys could help me it would be so nice. 

 

Hope I'm clear !