Hello, i am vtiger crm expert, with years long experience in implementing and customizing vtiger as per customers needs. I have also a lot of experience with PDF Maker, free and professional versions and i can show you lots of different templates that i have done over the time. I saw your request and it can be done in two ways, one calculating field directly in the crm using workflows or insert the fields in PDF Maker and calculate their values using custom functions that already exist or by creating new ones. Please feel free to ask me anything.
Best Regards,
Ardi